Biology Learner's Guide

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Cambridge Secondary 2

Learner Guide
Cambridge IG CSE ®
Biology 0610

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Contents
How to use this guide

1: How will you be tested?

About the papers
2: Exam advice

5
7

How to use this advice

General advice

Exam questions and marks

Command words

The style of questions

Advice for Papers 1 and 2

Advice for Paper 3

Advice for Paper 4

Advice for Papers 5 and 6

3: What will be tested?

4: What you need to know

How to use the table
5: Useful websites
Apps

24
95
95

6: Mathematical skills

7: Appendices

Other important information

Learner G uide

How to use this guide
This Learner Guide can be used to help you to plan your revision programme for the theory exams and will
explain what we’re looking for in the answers you write. It can also be used to help you revise by using the
revision checklist in section 4. You can check what you know, which topic areas you have covered and the
topics you need to spend more time on.
The guide contains the following sections:
1: How will you be tested?
This section will give you information about the different types of theory and practical exam papers that are
available.
2: Exam advice
This section gives you advice to help you do as well as you can. Some of the ideas are general advice and
some are based on the common mistakes that candidates make in exams.
3: What will be tested?
This section describes the areas of knowledge, understanding and skills that you will be tested on.
4: What you need to know
This shows the syllabus content in a simple way so that you can check:
the topics you need to know about
how the Extended syllabus (Supplement) differs from the Core syllabus
details about each topic in the syllabus
how much of the syllabus you have covered
5: Useful websites
6: Mathematical skills
7: Appendices
This section covers the other things you need to know, including:
information about terminology, units and symbols, and the presentation of data
the importance of the command words the examiners use in the exam papers
Not all the information will be relevant to you. For example, you will need to select what you need to know in
Sections 1 and 3, by finding out from your teacher which exam papers you’re taking.

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1: How will you be tested?
About the papers
You will be entered for three exam papers, two theory papers and one practical paper.
You will need to ask your teacher which practical paper you’re taking. Nearer the time of the exam, you will
also need to ask which theory papers you’re being entered for:
If your teacher thinks that you should enter for the exam based on the Core syllabus, you will take
Paper 1 (theory), Paper 3 (theory) and one of the practical Papers (5 or 6).
If your teacher thinks that you should enter for the exam based on the Extended syllabus, you will
take Paper 1 (theory), Paper 4 (theory) and one of the practical Papers (5 or 6).
Whether you take the Core or Extended papers will depend on the progress your teacher thinks you have
made and which option most suits your particular strengths. You should discuss this with your teacher.

About the theory papers
The table gives you information about the theory papers.

Paper

How long and how
many marks?

What’s in the paper?

What’s the % of
the total marks?

Paper 1

45 minutes
(40 marks)

40 multiple-choice questions. You
choose one answer you consider
correct from a choice of four possible
answers. The paper tests the Core
syllabus.

30% (you do either
Paper 1 or Paper 2)

Paper 2

45 minutes
(40 marks)

40 multiple-choice questions. You
choose one answer you consider
correct from a choice of four possible
answers. The paper tests the Extended
syllabus (Core plus Supplement topics).

30% (you do either
Paper 1 or Paper 2)

Paper 3

1 hour 15 minutes
(80 marks)

Short-answer questions and structured
questions. You should write your
answers in the spaces provided. The
paper tests the Extended syllabus
(Core plus Supplement topics).

50% (you do either
Paper 3 or Paper 4)

Paper 4

1 hour 15 minutes
(80 marks)

Short-answer questions and structured
questions. Questions will be based on
the Extended syllabus content (Core
and Supplement).

50%

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About the practical papers
Twenty per cent of the marks for Cambridge IGCSE Biology are for practical work. Practical work is not
based on specific syllabus content. You will need to practise the experimental skills listed in the syllabus, and
any other information you need will be given in the questions.
You will do one of the practical papers shown in the table. Your teacher will tell you which practical paper
you will do.
Paper

How long
and what
it’s marked
out of?

What’s in the test/paper?

Paper 5
Practical Test

1 hour 15
minutes
(40 marks)

You do a practical exam, which is supervised by a teacher.
There are usually two questions testing five skill areas.

Paper 6
Alternative to
Practical

1 hour
(40 marks)

You answer a written paper about practical work. There are
usually two or three questions, which test the same skill areas
as Paper 5.

Here is some more detail about each of the practical papers. If you’re unsure of anything, ask your teacher.

Paper 5 Practical Test
You do a practical exam, which is supervised by a teacher. In the exam you’re given an instruction sheet
which enables you to carry out the experiments, handle the data and draw appropriate conclusions. You may
be asked to:
carefully follow a set of instructions in a particular order.
use familiar and unfamiliar methods to record observations and make deductions from them by
performing simple tests, for example tests for food substances, using hydrogen carbonate indicator,
litmus and Universal Indicator paper.
use a scalpel or razor blade, forceps, scissors and mounted needles skilfully.
use a hand lens to observe and record information about biological specimens.
make clear line drawings of specimens.
perform simple arithmetical calculations, e.g. the magnification of a drawing.

Paper 6 Alternative to Practical
This is a written paper. You may be asked to:
carefully follow a set of instructions in a particular order.
follow familiar and unfamiliar methods to record observations and make deductions from simple
tests, for example tests for food substances, using hydrogen carbonate indicator, litmus and
Universal Indicator paper.
observe and record information about biological specimens from images.
make clear line drawings of specimens from photographs or micrographs.
perform simple calculations, including the magnification (enlargement) of a drawing.

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2: Exam advice
How to use this advice
Much of this advice is given in response to the types of answers that candidates have written in the past.
The advice is presented under various subheadings to help you when you prepare for your exams. Some
examples of questions and answers are included to illustrate some of the advice.
Make sure you read all the general advice. These can be important in any of the papers that you take.
Have a copy of the syllabus to look at as you read through these tips. Note the different columns –
the left hand side has all the Core topics; the right hand side has the Supplement topics.
Make sure you know which exam papers you’re taking before you look at the advice for the different
papers.
o You will take a multiple choice paper, either Paper 1, which is set on the Core syllabus, or
Paper 2, which is set on the Core and Supplement.
o You will take EITHER Paper 3, which is set on the Core syllabus, OR Paper 4 which is set on
the Core and the Supplement.
o You will take EITHER Paper 5, which is the Practical Exam, OR Paper 6, which is the written
paper about practical work known as the Alternative to Practical (often called the ATP).

General advice
Use your syllabus all the time while you’re revising and preparing for the exam papers.
You must know which topics you will be tested on.
Make sure you have all the equipment you will need for the exam in a clear, plastic container. You
need two pens, pencils (preferably HB or B), a clean eraser, a ruler (which measures in mm), a pencil
sharpener and a calculator.

Answering questions
The questions are meant to let you show the biology that you have studied. When you’re writing your
answers remember that another person has to be able to read it.
o Don’t waste time by writing out the question before you start to answer.
o Keep your handwriting clear and legible.
o Keep your answers on the lines on the question paper. Don’t write in the left hand side of the
paper or in the column marked For Examiner’s use. This is because papers are scanned and
the examiners mark them online. If you write in the margin your answers may not be visible.
o If you wish to change an answer, cross out your first answer and rewrite. Don’t write over
what you have already written.
o If you have to cross out something, put a line through it, don’t scribble over it.
o If you run out of space, use white space on another part of the exam paper for a
continuation answer; don’t try to squeeze in your answer by using very small writing.
o If you have to use a different space for a rewritten another answer or to continue an answer,
put a note to tell the examiner where it is, e.g. ‘see page 5’.
o Always try to write accurately using the correct biological terms. Candidates often lose
marks because they don’t use the vocabulary of biology correctly.
o Don’t use words like ‘it’, ‘they’, ‘effect’, ‘affect’ without any more explanation. A sentence
like ‘It has an effect on the body’ or ‘They affect the process’ does not say anything.

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Example 1
Question:
State why magnesium ions are important for healthy plant development.

[1]

Answers:
“They are needed by the plant” is true but too vague.
“They are needed by the leaves” is still too vague.
If these are the first answers that come into your head, ask yourself: What is it or they? What is the “need”?
“Magnesium is needed to make chlorophyll” is a better answer and would gain the mark
“Magnesium is part of each chlorophyll molecule” Good answer, one mark!
o
o

If you want to use the word ‘it’ or ‘they’ – think ‘what is it?’ or ‘what are they?’ and then
phrase your answer more precisely.
If you want to use the word ‘affect’ or ‘effect’ – think ‘how do they affect’ or ‘what is the effect
that they have?’

Terms
These are the names used in biology. Many of them are given in the syllabus. These terms will be
used in questions. You should make sure you use them correctly in your exam. Ask your teacher if
you’re unsure of the meanings of the biological terms used in the syllabus and in any textbook you’re
using. It is a good idea to write your own biological dictionary using the glossaries at the back of
books. You will notice that many terms are defined in the syllabus, so that is a good place to start
when making your own dictionary.
o Try to use the correct spelling. The person marking your answer will try to recognise what
word you mean, but if the spelling is too far out or ambiguous, then they can’t allow you a
mark.
o Some biological terms have very similar spelling. One example is ‘ureter’, urethra’ and
‘uterus’. If the answer is ureter and your mis-spelling is ‘uretus’, it is not clear enough as you
could have thought the answer is ‘uterus’. Other common examples are ovum/ova, ovary
and ovule; testes and testa; sucrose and sucrase. Make sure you write clearly and always try
to spell as accurately as you can.
o Don’t try to mix the spellings of two words when you’re not sure which of them is the correct
answer. For example, you might write ‘meitosis’ when you’re not sure whether the answer is
mitosis or meiosis, or urether, when you’re not sure if the answer is ureter or urethra. In both
cases you would not get the mark.
o You need to check carefully that you have used the right word when similar terms are used
in the same topic, e.g. urea and urine, ureter and urethra, semen and sperm.

Writing in your own words
You sometimes have to write two or more sentences to answer a question.
o Use short sentences. If you write long sentences you can become confused and your
meaning is lost. You might also write something contradictory. It is hard for the examiner to
find correct statements in a muddled answer.
o You’re often asked to write down something you have learned. Make sure you have learnt the
meanings of the common terms used in biology, e.g. photosynthesis, osmosis and
fermentation.
o In the revision checklist there is a list of the terms which you should be able to define. You
also need to be able to write down the meaning of more complicated ideas, e.g. levels of
organisation, natural selection, artificial selection, global warming and eutrophication.

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Exam questions and marks
Example 2
It helps to highlight the main features of a question. You can’t use a highlighter pen, so the best thing to do is
to underline or circle key words in the questions.
Question
Name the tissue that transports the sugars made by photosynthesis to other parts of the plant

[1]

This tells you that should write a one word answer about plant transport of sugars. Underline the command
word (which is not always at the start of the question) and the biological terms as you read the question.
Make sure you know which part of your biology is being tested.
Read the whole of a question including all the stimulus material and parts (a), (b), (c) (i) and (c) (ii), etc.
carefully before you begin to answer. Some of the parts have similar answers so you need to work
out the differences between them. If you write exactly the same thing in different parts of the same
question, then only one of them might be a correct answer.
There is often stimulus material for each question. This might be a photograph, diagram, drawing,
flow chart, table of data, graph or just some text. Read all of this information carefully and study any
pictures, tables or graphs that are included. All of it is relevant to the questions.
The stimulus material is often about something you have not studied. Don’t panic. There will be
enough information in the question for you to work out an answer. You’re being tested on your ability
to apply your knowledge to new information.
All the different parts of a question may be about the same topic, e.g. digestion or photosynthesis,
but you should be prepared for questions that test different topics, e.g. digestion, enzymes and
assimilation.
Look for clues in the words of the question. For example, if you see the word mammal in the
question, you know that the animals are warm blooded and have biological systems like ours.
If you’re only given a Latin name or a name you don’t recognise, e.g. eland, look to see if you’re told
anything about it. If you’re told that an eland is a herbivore, then you know it eats plants.
Answer each question as far as you can. Don’t spend a long time staring at a question.
If you don’t know the answer or how to work it out, then leave it and come back to it later. It is best
to put a mark by the side of the question so you can find it easily. An asterisk (*) is a good idea or a
large question mark against the letter of the part question. Not all part questions have answer lines
so you may not see a question that you have left out when you turn through your script towards the
end of the exam.
Try not to leave blanks. Always check through your script towards the end of the exam. When you
come back to a question you may remember what to write as an answer to a question that you left
out earlier in the exam.
Don’t waste time by writing about things unrelated to the question.
In Papers 1 and 2 there is one mark for each question.
The number of marks is printed on the exam papers for Papers 3, 4, 5 and 6. The mark available for
each part question is printed in square brackets, e.g. [2]. The number of marks helps you decide how
much to write. The total number of marks for each question is printed at the end of the last question,
e.g. [Total: 12].
The number of marks is a guide to how long to spend on each question or parts of a question.
Don’t waste time and write a long answer for a question which has one or two marks. You will not get
any extra marks even if your answer is full of many correct and relevant statements.
If there are two or more marks don’t write the same thing in two different ways, e.g. “The leaf is
very large. The leaf has a large surface area”. Notice that the second sentence is more accurate and
is preferable to the first one.

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Command words
These are called command words and tell you what to do.
You can find all the command words in the Glossary of terms used in science papers which is at the
end of your syllabus.
If a question asks you to ‘Name’ or ‘State’ two things only the first two will be marked. Use the
numbered lines for your answers if they are given on the question paper. If you write more than two
and the first is correct, the second one is wrong, and the third one correct, you will only get one
mark.
Some questions have two commands in the question, for example ‘Predict and explain’. This means
you have to say what you think will happen AND then say why you think it will happen. Usually the
word and is printed in bold type to help you. See the section below for advice about answering
questions that have two command terms and require an extended answer.
The table on the following page has a list of terms used in biology papers to tell you what to do in an
answer. Make sure you know what you should do in response to each command word.
Example 3
Question 1
Name the process by which green plants make sugars.

[1]

All you need to write for your answer is ‘photosynthesis’.
Question 2
Define the term photosynthesis.

[2]

This requires a full sentence:
‘The process by which green plants make carbohydrates from raw materials using energy from light.’
This is very similar to the definition given in the syllabus so would easily gain both marks.
You can find out more about command terms in the ‘Glossary of terms used in science papers’
towards the end of the syllabus. These notes should help you know how to respond to each of the
command words.
Command words

What you should do in response to each command word

Define

Give a definition – use the definitions given in the syllabus

What do you understand by
the term .....?

Give a definition or a fairly brief explanation of what the term means. You can
use an example to illustrate if this seems appropriate

State

Brief answer – maybe one word or a phrase

List

A number of brief answers should be given; usually you’re asked for a specific
number of points. You don’t gain extra marks by writing more than the
number stated

Describe

You may have to describe the steps in a process or describe the appearance
of a biological structure
You may also have to describe some data given in a table or a graph. Make
sure you have the correct vocabulary for such a description. Use the words
increase, decrease, constant, peak, maximum, minimum, etc.

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Explain

This is not the same as describe. You should give an answer that has some
reasons. You may have to explain why something happens or how it happens

Discuss

You may be asked to discuss advantages and disadvantages – so make sure
you give some of both. Much depends on the type of question, but ‘discuss’
usually means you should give different sides of a story or an argument

Outline

This is not the same as describe. You should give the main important points
without any detail

Predict

This means you should state what you think will happen. You may be asked
to justify your prediction or explain it; explanation is not required if all the
question says is “predict....”

Suggest

This is often used when there is no single correct answer; you should look
through the information you have been given for some clues as to what to
‘suggest’ in response to the question. Many problem-solving questions use
this command word

Calculate

This is obvious; make sure you know how to calculate percentages,
percentage changes, rates and ratios (for genetics). Always give your working
even if not asked. Always make sure you use the correct units

Measure

You should use a suitable measuring instrument to take a reading. Usually
this involves using a ruler to measure to the nearest mm. Make sure you
write down the unit after the numerical answer

Determine

This is not the same as ‘measure’. Either you should explain how an
experiment should be set up to take measurements or how you should make
a calculation from some results or data given in a table or graph

Estimate

You don’t have to give an accurate answer – but your answer (which is
usually numerical) should only be approximate

Sketch

This is usually used about graphs. You should put a line (straight or curved)
on a pair of axes. This may be a graph that has a line on it already or it may
be pair of axes printed on the exam paper without a line or curve

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The style of questions
Identify features of cells, tissues, organs or other structures
You may be expected to name some structures that are identified by letters on a diagram or
drawing.
You may have to put labels on a diagram using label lines.
Example 4
Question:
Use label lines to identify the following on the drawing of a flower: petal, sepal and stamen.

[3]

To answer this question:
You have to know the structure of a flower.
You also have to be able to find the structures on a diagram of a flower that you may never have studied.
You then have to draw a label line to the structure and write the name next to the labelling line.
If you don’t draw a label line you may not get any marks even if you have found the correct structure.

Use information given in the question

Questions may ask you to ‘Use examples from...’ or ‘Use only the information in ....’ or ‘With
reference to Fig. 6.2’. If you read instructions like these, find out what you’re expected to use as
examples or take information from. You will not get any marks if you use examples from somewhere
else. The information can be given to you in different ways:
o a diagram, such as a food web, a set of apparatus or a biological structure;
o a graph, which could be a line graph, a bar chart or a histogram – always check the headings
and units carefully;
o a table – always read carefully the headings of the columns and/or rows and look for any
units.

Example 5
You may have to give examples to show that you understand an idea in biology.
Question that includes a food web as its stimulus material.
Name one example of each of the following from the food web: producer, primary consumer and tertiary
consumer.
To answer this question you have to know definitions of producers, primary consumers and tertiary consumers.
Then you have to show that you understand how these terms apply to the food web shown in the diagram. If
you put examples from other food webs you have learned, you will not get any marks.

Example 6
Question that includes a diagram of a cross section of a leaf.
Describe and explain the advantage of the distribution of chloroplasts in leaves, as shown in the diagram.
To answer this question you have to observe the diagram and describe which cells have the most
chloroplasts. Then you have to work out why this arrangement might help photosynthesis. If you only write
about the functions of chloroplasts you will not get any marks.

Interpreting tables and graphs
The stimulus material may be in the form of a table, line graph, bar chart or histogram.
Always read the introductory text very carefully before you study the table or graph. Underline key
points in the information that you’re given. In Paper 4, there may be quite a bit of introductory text
explaining how the information was collected, e.g. from an investigation.

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Tables

Look at the column and row headings in a table and make sure you understand them. If you have
read the introduction carefully, then you will.
Find the units that have been used. Make sure you use them if you give any figures in your answer.
Use a ruler to help read the table. Start on the left with the first column. This should be the
independent variable and should increase in steps. Now put the ruler to the right of the next column
and look at the figures in this second column. Look for a pattern or trend in the figures. Identify the
pattern or trend first before thinking of an explanation. Move the ruler across to the right of the third
column if there is one and continue in the same way. It may help to sketch a little graph on the exam
paper to help you identify any pattern or trend.

Line graphs
Look carefully at the x- axis which is the independent variable and make sure you understand what
has been changed. Look carefully at the y- axis which is the dependent variable. Both variables
should be described in the introduction to the question.
Put your ruler against the y- axis and move it gradually across the graph from left to right. Follow the
pattern or trend of the line (or each line if there is more than one). Mark on the graph where
something significant happens. For example, the line might show that the dependent variable
becomes constant (gives a flat horizontal line).
Bar charts and histograms
Look carefully at the x- axis and the y- axis to see what has been plotted. Again, it is a good idea to
move a ruler across the bar graph or histogram to help you concentrate on one aspect at a time. You
can identify the highest and lowest figures and see if there is any pattern.
You should make yourself some notes about the table, graph or histogram before answering the
questions.
On Papers 3 and 4, you might be asked to complete a graph, bar chart or histogram. If so, you
should look carefully at the question to see what you’re being asked to do. You may have to add one
or more points to a line graph and then add a suitable line. There is advice about how to draw lines
on line graphs in the section of general advice for Papers 5 and 6.

Calculations
If you’re asked to do a calculation:
o You may have to find the figures from a table or graph.
o Write out all the working for your calculation. If you make a mistake and give the wrong
answer, you may well be given marks for showing how to do the calculation.
o Make sure that you show the units in the calculation.
o If the units are not given on the answer line, then make sure you write them after your
numerical answer.
o Often you will be asked to carry out a calculation and add the result to a table. Always
express your answer in the same way as the figures given in the table. If the other figures
are 5.6 and 4.6, then your answer should be given to one decimal place, even if the answer
is a whole number where you should write 7.0, not 7.
o If you use a calculator, round up or down the figures – don’t copy all the figures after the
decimal point.

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Equations
If you’re taking Paper 3, then you should know word equations for photosynthesis, aerobic and
anaerobic respiration. If you’re taking Paper 4, then you should also know the chemical equations and
be able to use the chemical symbols correctly. You should know the correct formulae for the
compounds involved.
If you’re asked to give either a word or a symbol equation, don’t combine symbols and words in the
same answer.
Example 7
Question:
Write the word equation for anaerobic respiration in yeast
Correct answer:

glucose

This is an incorrect answer: ‘glucose

[2]

carbon dioxide + ethanol + energy
CO2 + ethanol and energy’, as there is a mixture of words and

symbols. It would probably get one mark out of two.
Question:
Write the chemical equation for anaerobic respiration in yeast
Correct answer:

C6 H12O6

[2]

2C2H5OH + 2CO2 + energy

Note that you should use subscripts correctly when writing out the formulae of glucose, alcohol (ethanol),
carbon dioxide, lactic acid and water in these equations.

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Example 8
Question:
State two ways in which arteries differ from veins.

[2]

Correct answer:

1 Arteries have thicker walls than veins.
2 Veins have semi-lunar valves, but arteries don’t.

Ambiguous answer:

1 They have thick walls.

2 They don’t have valves.

No marks would be given to the second answer as the comparisons have not been made.
Question:
Complete the table to compare the structure of arteries with the structure of veins.

[2]

Correct answer:
Arteries

Veins

has thick wall

has thin wall

thick muscle layer

very thin muscle layer

Incorrect answers as the comparisons are not made between the same features.
Arteries

Veins

thick wall

thick elastic layer

no valves

small amount of muscle

In cases like this, it is much better to have an extra column that gives the features to be compared:
Feature

Arteries

Veins

thickness of wall

thicker

thinner

valves

absent

present

This ensures that you make direct comparisons in each row of the table. You can always add a first column if
it is not included in the question.

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Making comparisons
If you’re asked to compare two things make sure you make it clear which thing you’re writing about.
o The question may ask you to compare two structures or two processes that you have learnt
about.
o Sometimes you may be expected to do this on answer lines in which case you must make
clear the items that you’re comparing (see Example 8).
o You may be given a table to complete. This may be blank and you have to fill it in, or it may
already have some entries and you complete it.
o If you’re given lines to make the comparison, it is perfectly acceptable to draw a table for
your answer.
o A question may give a table of data and then ask you about it. Make sure you only use
information from the table; for example, in a table that shows the composition of normal
breast milk and colostrum, you can see which milk contains more fat, protein and sugar. Your
answers should start with ‘colostrum has more …….. than breast milk’ or ‘breast milk has
more …… than colostrum’. Don’t put ‘It has more protein’.
Extended writing. You’re required to write longer answers to questions that have four or more
marks. There are more of these questions in Paper 4 than in Paper 3.
Example 9
Question:
Explain what happens if excess nitrogen fertiliser is washed into a stream or pond

[4]

The mark scheme for a question like this will have a list of points that the examiner will be looking for in your
answer. There will be more points than there are marks, so you don’t need to put them all in your answer.
The points for this question could be:
Algae and aquatic plants grow faster using the fertiliser.
Algae cover the water surface.
Light can’t pass to aquatic plants lower down.
These plants die.
Bacteria/decomposers, decay or feed on the dead plants.
Bacteria/decomposers, increase in numbers.
Bacteria/decomposers use aerobic respiration.
They use up oxygen.
There is not enough oxygen for the respiration of other organisms which live in the water.
These organisms die.
The process is called eutrophication.
If your answer is something like ‘The fertiliser causes low oxygen and it affects animals in the water’ you will
not get any marks. The answer is much too short and too vague. If your answer is something like ‘The
animals don’t have enough oxygen for their respiration and they die’ you may get two marks.
o

o
o

When you answer these questions always use full sentences if you can. If you find it helps
to write bullet points, then make sure each bullet point is a full sentence. If you abbreviate
your answer too much by writing notes, then you may not convey enough information to gain
the marks.
If you’re giving a sequence of events (as in Example 9), then you should make sure they are
in a logical order. If you’re explaining a biological principle or making comparisons, then give
the main points first.
If you’re describing something that moves from one place to another, then make sure you
include the direction of movement. For example, ‘water moves by osmosis’ is unlikely to gain
a mark unless you include the direction; ‘water enters the cell by osmosis’ is a much better
answer.

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Advice for Papers 1 and 2
You have about one minute to read and answer each question. Each question tests just one topic.
Some questions test what you know and understand. For example: What tissue in the eye detects
light?
Some questions test if you can apply what you have learned to understand new data. These
questions will often have a diagram, graph or table to use.
Try to decide what the question is testing as you’re reading it. The sequence of questions usually
follows the sequence of topics in the syllabus.
Example 10
Question:
Four blood vessels are labelled as A, B, C and D on a diagram of the human circulatory system.
This is followed by the question:
In which vessel will absorbed alcohol first be found?
You need to think about what the question is asking.
Is it about digestion?
Is it about excretion (of alcohol)?
Is it about the circulation?
The question is asking about something absorbed from the gut to be transported, so it is about circulation.
Which vessel carries substances absorbed by the gut?
Answer:

The hepatic portal vein.

So you have to decide whether the vessel is an artery or a vein, then realise that it is a vein taking blood away
from the organ that absorbs alcohol.
Then choose the letter, which labels the hepatic portal vein.
Don’t try to find a pattern in the order of your answers (e.g. A, B, C, D, A, B....)
o The same letter could be the correct answer for several questions in a row.
o Letter A might be the correct answers for more questions than B, C or D. Or there could be
fewer correct answers shown by letter D than any of the others.
o Don’t let what you have chosen for the previous questions influence which letter you
choose.

Advice for Paper 3
Most of the questions require short answers. This means that you write mainly one word or one
sentence answers worth one mark.
Longer answers will need two or three sentences with two or three different ideas. Always look at
the number of marks for each part question to help you decide how much to write.
Look at the number of command words: ask yourself ‘do you have to do one or two things?’
Use the lines given. Stick to the point and don’t write too much.
Only give the number of answers that are asked. Use the numbered lines and give one answer per
line.
There will only be a few parts of questions that need extended writing. These will have four [4] or [5]
marks. The question will often be related to some information you’re given. You will need to write
four or five sentences in a sequence that makes sense. You can think of it like ‘telling a story with a
beginning, a middle and an end’. Remember to refer to any information you’re given.

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Advice for Paper 4
There is more to read in this paper than in Papers 1, 2 or 3.
Many questions will be based on one, two or three sentence answers. Always look carefully at the
number of marks for each part question.
Look carefully at the number of command words – do you have to do one or two things, for example
describe and explain.
Look carefully to see if you’re asked for an actual number of answers. Only give that number. Use
the numbered lines and give one answer per line.
There are questions that may start in one part of the syllabus and link to another, e.g. the information
could be about the animals in a particular habitat and what they eat. The first parts of the question
might be about the food chains or food webs which include these animals. A later part of the
question could be about teeth or about factors in the environment.
You’re likely to be asked to interpret unfamiliar data, e.g. results from an experiment that you may not
have carried out or could not be carried out in a school. Don’t be put off. Follow the same advice as
before. There will always be enough information in the question for you to answer it.
You’re likely to have questions about events and situations that are new to you. Don’t be put off. The
question will tell you all you need to know. Read the information carefully and if it is not immediately
apparent, look for clues that will tell you which part of the syllabus the question is about.

Advice for Papers 5 and 6
General advice
Read through the questions carefully, looking to see how many marks are given for each question.
In Paper 5, you have to follow a set of instructions. Read these to the end first, before you start.
In Paper 6, you will have to read some information about an experiment. Again, read these very
carefully.
Divide the time of your exam in proportion to the marks given.
If you’re taking Paper 6, make sure that you have done plenty of practical work so you can imagine
what has happened to obtain the results that you will process, analyse and interpret in the questions.
Make sure that you have a sharp pencil to use for making drawings and drawing graphs and charts.
Don’t draw in ink because you can’t make changes as you can when using a pencil.
Make sure you have a good, clean eraser for rubbing out your pencil lines if necessary. Don’t press
too hard when using a pencil for making drawings, graphs or charts. Sometimes it is hard for an
examiner to tell what your final line on a scanned script is.

Recording your observations
In both papers you’re expected to make observations and record them.
You can record your observations:
o as statements in writing
o in tables
o by using drawings
o by constructing tally charts.
You can process your observations by:
o carrying out calculations, e.g. percentages and percentage changes
o plotting graphs – line graphs, bar charts and histograms.
Use all the space available on the paper for your observations.
Don’t write an explanation until the question asks for one.
Use a sharp HB or B pencil. It can be rubbed out easily if you need to correct a mistake. Use a good
eraser as traces of pencil lead are detected when your paper is scanned.
Don’t forget headings for the columns and the rows in tables and in axes on graphs. Don’t forget to
include the units.
Make drawings as big as the space allows.
Use a ruler for labelling lines.
Label in pencil.
Use one clear continuous outline not an artistic drawing. Don’t shade other than using very light
dots.

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Drawing tables
If you’re asked to draw a table:
o Use a ruler and a pencil to draw the table. Make sure you rule lines for the columns and the
rows.
o Write headings for each column and/or row of the table.
o Write in units if they are needed, e.g. volume of water/cm 3, mass of seed/g. The unit should be
written after the oblique line (forward slash).
o Don’t put units in the table spaces where you write numbers.
Make sure you use the same number of decimal places in each column and/or row.
o If you’re asked to draw and/or complete a tally chart for recording data:
o Make sure that you rule up a table and use clear headings.
o Record the numbers by using strokes and putting an oblique line to represent 5:
o /// = 3; //// = 4 and //// = 5
o Include a column to show the total numbers.

Drawing line graphs
If you’re asked to draw a graph:
o Choose a scale which uses most of the grid provided on the exam paper.
o Choose a simple scale, e.g. one large square is equal to 1, 2, 5 or 10 units in the data. Don’t
make it difficult to plot the data by using a scale such as one large square = 3 or 6.
o Write the name of each axis and the correct unit, e.g. rate of water loss/g per h,
temperature/ °C, time/s.
o Plot the points exactly using a sharp pencil. Draw the points lightly so that you can rub them out if
you need to. Make them more definite when you’re sure they are right.
o Use a cross (x) or a dot in a circle (0) for your plot points. Don’t use a single dot as it may
not be seen after you have drawn your line.
o If you have to plot two lines on a graph, use two different symbols for the plot points. You
can use a cross, a dot in a circle or a plus sign (+). Label each line carefully or use a key. Use
a pencil for both lines; don’t use a blue or black pen or different colours as these don’t show
up on scanned scripts.
o Read the question carefully before you put a line in the graph. Look carefully at the points.
You have to decide whether to use a straight line of best fit, a smooth curve of best fit or
join the points by straight lines. Always use a sharp pencil.
o Remember that lines of best fit don’t have to pass through the point where the two axes
meet (the origin). If you’re sure that 0, 0 is a point then you can include it. For example, in an
investigation of the effect of the concentration of enzyme on enzyme activity 0, 0 means that
there is no enzyme present. If there is no enzyme there can be no activity, so 0, 0 could be
included.
Don’t extend your line graph beyond the last plotted point.
Bar charts have separate columns that don’t touch – there are gaps in between; histograms have
columns that do touch each other. Bar charts are used to show data on discontinuous variables, for
example blood groups, eye colour, etc.; histograms are used to show data on continuous variables,
e.g. length, mass, speed, volume, etc.

Drawing bar charts
You may have to draw a bar chart (Papers 5 or 6) or add some data to a bar chart (Papers 3 and 4).
You draw a bar chart when you have different categories, such as the numbers of six different
species in a habitat.
o Choose a scale which uses most of the grid provided on the exam paper; don’t make the
chart too small.
o Draw the chart in pencil.
o Rule the columns evenly so that they are all the same width.
o Take care to rule the top of each block in the correct place – double check with the table of
data each time.
o The spaces between the columns on the x-axis should be identical; they should be the
same length, e.g. one large square on graph paper.
o The y-axis should be properly scaled with equal intervals just as in a line graph.
o The y-axis should be labelled with units.
o The lines or blocks can be arranged in any order, but to make comparisons it helps if they
are arranged in descending or ascending order of size.

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o

You should identify each block by putting a label directly underneath each block. Don’t
shade the blocks or colour code them.

Drawing histograms
Histograms are ways of displaying the variation in a particular feature, for example the lengths of
leaves on a tree. If you measure the lengths of leaves you would have to divide the data into classes,
such as 50–54 mm, 55–59 mm, 60–64 mm, etc. The numbers would be recorded in a tally table.
o Choose a scale which uses most of the grid provided on the exam paper; don’t make the
histogram too small.
o Draw the histogram in pencil. The x-axis represents the independent variable and is
continuous. It should be properly scaled and labelled with appropriate units.
o The blocks should be drawn touching.
o The area of each block is proportional to the size of the class. It is usual to have similar-sized
classes (as in the example above) so the widths of the blocks are the same.
o The blocks should be labelled either by putting the class ranges (e.g. 60–64, 65–69 etc.)
underneath each block or by putting the lowest number in each range (e.g. 60, 65, 70, etc.)
under the left-hand side of the relevant block.
o The y-axis represents the number or frequency and should be properly scaled with equal
intervals. It should be labelled with appropriate units.

Planning investigations
Sometimes you’re asked to suggest a way of carrying out an investigation or to improve the method that is in
the question paper.
When you read through an investigation try to work out three main things:
(1) What is being changed – this is called the independent variable.
(2) What is being measured – this is called the dependent variable.
(3) What is being kept the same – these are the control variables.
Example 11
In a question to investigate the effect of temperature on enzyme activity:
the independent variable is temperature.
the dependent variable may be the time taken for a solution of the substrate to change its appearance.
the key control variables are the concentration of the enzyme solution, the volume of the enzyme solution,
the concentration of the substrate solution and the volume of the substrate solution. These are the variables
that must be kept constant if you’re to find out the effect of changes in temperature.
Some investigations need to have two parts:
o The experimental – which measures the process being studied and contains the living
organism, part of an organism (e.g. a leaf) or enzyme being tested.
o The control – which will be exactly the same as the experimental except that the living
organism will be missing or replaced by something non-living. The control shows that the
results are due to the activity of the living organism and is not due to the apparatus or an
environmental factor.
All investigations should be repeated to increase the reliability of the results. If the same results are
achieved (or the results are very similar) then they are reliable.
The precision of results taking may not be very good. For example, if you’re measuring using a
syringe or measuring cylinder it may be difficult to measure to the nearest cm3. You should think
about ways in which the precision can be improved.
Give quantities in appropriate terms – avoid the use of term ‘amount’ as this does not convey precise
meaning to any specific quantity. ‘Amount’ could mean volume, mass or concentration. Always be
precise and use these words; avoid writing the word ‘amount’. For example, you can give the volume
in cm 3, mass in grams and concentration in an appropriate unit such as grams per 100 cm3.

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Paper 5 advice
In Paper 5 you’re following instructions, using laboratory equipment, making observations, recording results
and drawing conclusions.
Start by reading the entire first question.
Think about the apparatus that you will use for each step and imagine using it in your mind.
Check the time to be allowed and imagine following the instructions.
Do the same when you’re ready to begin the next question.
Following the instructions
Follow the instructions for practical methods exactly. If you make a change in the method you might
alter the results.
Don’t take short cuts.
Always label test tubes and other containers to help you remember which is which.
If you’re told to ‘Wash the apparatus thoroughly after each use’ make sure you do. If there is anything
left in the apparatus the next stage may not work.
If you have to measure a specimen make sure you draw a line on your drawing to show where you
made your measurement.
It is a good idea to put a tick by the side of each instruction when you have completed it. This helps
you to find the right place in the instructions, so that you don’t leave out a step or repeat a step
when it is not required.
Keep your exam paper on a part of the bench which you can keep dry. Don’t pour liquids or use
syringes or pipettes over your exam paper. If you keep our exam paper away from the ‘wet’ part of
your bench you’re unlikely to spill anything on it.
Recording your observations
Don’t forget that observations can be seen, heard, felt and smelled, e.g. colour, fizzing, warming,
smell of a flower, texture (feel) of a fruit.
You can always find something to observe, so make sure you record something for each
observation.
Write down exactly what you observe.
e.g. if you add a drop of iodine solution to a drop of starch solution on a white tile, the colour
changes.
o You should write ‘the colour changed from yellow to blue-black’.
o If you write ‘it turned black’ you have not given all the information.
o If you add iodine solution to a drop of water on a white tile, you should write down ‘the
colour stayed yellow’. If you write ‘the colour stayed the same’, or ‘no change’, you have left
out important information.
Drawings
These will be from specimens or photographs.
Read the question carefully, the drawing may have to be an accurate size e.g. twice the original.
Make each drawing as big as the space allows.
Use a ruler for labelling lines.
Label in pencil.
Use one clear continuous outline not an artistic drawing. Don’t shade other than using very light dots.
Observe details carefully, such as number of seeds in a seed case, thickness of a layer in a shell, etc.
Show these accurately on your drawing.
Taking measurements
Make your measurements as accurate as you can. Measure to the nearest unit, e.g. mm. Don’t try
and ‘guess’ 0.5 mm.
Make sure you put units! Use the correct SI units, don’t use other units; for example measure in
millimetres not inches.
Always measure in millimetres, not centimetres.
If you have to make calculations on your measurements, use the blank pages within the paper but
indicate if the answer is continued elsewhere on the blank pages. Don’t write in the margins.
Write neatly and show your working. The person marking your paper might be able to give you
marks for knowing what to do if you make a mistake or don’t finish the calculation.

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Conclusions
Use your own results for your conclusions.
Before planning what to write for a conclusion, turn back to the beginning of the question and read
the introduction. You may have forgotten what you were told about the investigation you have just
carried out. Think about the theory and apply it to the results you have obtained.
Sometimes you’re expected to make conclusions about some other data, not the data you have
collected.
Don’t write the conclusion you have learned from a class experiment or from theory.

Paper 6 advice
The topics on Paper 6 will be very similar to those on Paper 5, so the advice is very much the same as for
that paper. Because you’re not doing any practical work, there is usually a third question.
In this paper you’re making observations from information given in the paper, recording results and drawing
conclusions. Try to imagine doing the practical which has produced the results in the questions and look very
carefully at the information you’re given as it will almost certainly be unfamiliar to you.
Recording observations
Some of your observations are based on photographs or diagrams on the paper.
Write down exactly what you see – as differences or similarities. Measurements may need to be
made and magnifications calculation.
Look carefully at photomicrographs as these will be enlarged, e.g. x 100. If you’re asked to calculate
a magnification follow these steps:
o measure the structure in the photograph in millimetres (not centimetres).
o look for the actual size of the object – you will be given this.
o divide the length of the structure in the photograph (in mm) by the actual size (in mm).
o the answer is the magnification; round up or down the answer from your calculator.
o usually magnifications are given as whole numbers, so don’t give the answer to one or more
decimal places.
If you’re asked to calculate an actual size follow these steps:
measure the structure in the photograph in millimetres (not centimetres).
look for the magnification – you will be given this.
divide the length of the structure in the photograph (in mm) by the magnification.
the answer is the actual size in millimetres; round up or down the answer from your calculator.
actual sizes could be given as whole numbers or you could include one or two decimal places, but
no more.

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3: What will be tested?
The examiners will take account of the following areas in your exam papers:
your knowledge (what you remember) and understanding (how you use what you know and apply it
to unfamiliar situations).
how you handle information and solve problems.
your use of experimental skills.
These areas of knowledge and skills are called assessment objectives. The theory papers (Papers 1 and 3, or
Papers 2 and 4) test mainly Assessment Objective 1 (knowledge with understanding) and Assessment
Objective 2 (handling information and problem solving). The purpose of the practical paper (Paper 5 or 6) is to
test Assessment Objective 3 (experimental skills). Your teacher will be able to give you more information
about how each of these is used in the exam papers.
The table shows you the range of skills you should try to develop:
Assessment
Objective

What the skill
means?

What you need to be able to do?

AO1
Knowledge with
understanding

remembering
facts and
applying these
facts to new
situations

1.
2.
3.
4.

AO2 Handling
information and
problem solving

how you extract
information
and rearrange
it in a sensible
pattern and
how you carry
out calculations
and make
predictions

1. select and organise information from graphs, tables
and written text
2. change information from one form to another, e.g.
draw chart and graphs from data
3. arrange data and carry out calculations
4. identify patterns from information given and draw
conclusions
5. explain scientific relationships, e.g. changes in heart
rate in relation to activity
6. make predictions and develop scientific ideas
7. solve problems

AO3
Experimental
skills

planning and
carrying out
experiments
and recording
and analysing
information

1. set up and use apparatus safely
2. make observations and measurements and record
them
3. analyse experimental results and suggest how valid
they are
4. plan and carry out your own experiment and
describe to what extent your plan worked and
suggest improvements

use scientific ideas, facts and theories
know scientific definitions e.g. what is excretion?
know about biological apparatus and how it works
know about S I units, quantities (e.g. mass) and
symbols (e.g. dm 3)
5. understand the importance of science in everyday
life

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4: What you need to know
The table describes the things you may be tested on in the exam. It is arranged in 21 topic areas. If you’re
studying only the Core material (Papers 1 and 3), you will need to refer only to the column headed Core
material. If you’re studying the Extended syllabus (Papers 2 and 4), you will need to refer to both the Core
and Supplement material columns. Read Section 1 if you’re unsure about which material to use.

How to use the table
You can use the table throughout your course to check the topic areas you have covered. You can also use it
as a revision aid. When you think you have a good knowledge of a topic, you can tick the appropriate box in
the checklist column. The main headings in the topic areas are usually followed by the details of what you
should know.
Test yourself as follows:
cover up the details with a piece of paper
try to remember the details
when you have remembered the details correctly, put a tick in the appropriate box.
If you use a pencil to tick the boxes, you can retest yourself whenever you want by simply rubbing out the
ticks. If you’re using the table to check the topics you have covered, you can put a tick in the topic column
next to the appropriate bullet point.
The column headed ‘Comments’ can be used:
to add further information about the details for each bullet point
to add learning aids
to highlight areas of difficulty/things which you need to ask your teacher about.

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Topic

Core material
You should be able to:

Checklist

Supplement material
Comments

You should be able to:

Checklist

Comments

1. Characteristics and classification of living organisms
1.1 Characteristics
of living
organisms

Describe the characteristics of
living organisms by defining the
terms:
o movement as an action by
an organism causing a
change of position or place

o respiration as the chemical
reactions in cells that break
down nutrient molecules
and release energy

sensitivity as the ability to
detect and respond to
changes in the environment

o growth as a permanent
increase in size

Define the terms:

o movement as an
action by an
organism or part of
an organism
causing a change of
position or place
o respiration as the
chemical reactions
in cells that break
down nutrient
molecules and
release energy for
metabolism
o sensitivity as the
ability to detect or
sense stimuli in the
internal or external
environment and to
make appropriate
responses
o growth as a
permanent increase
in size and dry mass
by an increase in
cell number or cell
size or both

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Topic

Core material
You should be able to:

o reproduction as the
processes that make more
of the same kind of
organism
o excretion as removal from
organisms of toxic materials
and substances in excess of
requirements

o nutrition as taking in of
materials for energy, growth
and development

Cambridge IG CSE® Biology 0610

Checklist

Supplement material
Comments

You should be able to:

o excretion as
removal from
organisms of the
waste products of
metabolism
(chemical reactions
in cells including
respiration), toxic
materials, and
substances in
excess of
requirements
o nutrition as taking in
of materials for
energy, growth and
development; plants
require light, carbon
dioxide, water and
ions; animals need
organic compounds
and ions and usually
need water

Checklist

Comments

Learner G uide

Topic

Core material
You should be able to:

1.2 Concept
and use of a
classification
system

State that organisms can be
classified into groups by the
features that they share
Define species as a group of
organisms that can reproduce to
produce fertile offspring
Define and describe the binomial
system of naming species as an
internationally agreed system in
which the scientific name of an
organism is made up of two
parts showing the genus and
species

Checklist

Supplement material
Comments

You should be able to:

Checklist

Comments

Explain that classification
systems aim to reflect
evolutionary
relationships
Explain that classification
is traditionally based on
studies of morphology
and anatomy
Explain that the
sequences of bases in
DNA and of amino acids
in proteins are used as a
more accurate means of
classification
Explain that organisms
which share a more
recent ancestor (are
more closely related)
have base sequences in
DNA that are more
similar than those that
share only a distant
ancestor

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Topic

Core material
You should be able to:

1.3 Features of
organisms

List the features in the cells of all
living organisms, limited to
cytoplasm, cell membrane and
DNA as genetic material
List the main features used to
place animals and plants into the
appropriate kingdoms
List the main features used to
place organisms into groups
within the animal kingdom,
limited to:
o the main groups of
vertebrates: mammals,
birds, reptiles, amphibians,
fish
o the main groups of
arthropods: myriapods,
insects, arachnids,
crustaceans

1.4 Dichotomous
keys

Construct and use simple
dichotomous keys based on
easily identifiable features

Cambridge IG CSE® Biology 0610

Checklist

Supplement material
Comments

You should be able to:

List the features in the
cells of all living
organisms, limited to
ribosomes for protein
synthesis and enzymes
involved in respiration
List the main features
used to place all
organisms into one
of the five kingdoms:
Animal, Plant, Fungus,
Prokaryote, Protoctist
List the main features
used to place organisms
into groups within the
plant kingdom, limited to
ferns and flowering
plants (dicotyledons and
monocotyledons)
List the features of
viruses, limited to
protein coat and genetic
material

Checklist

Comments

Learner G uide

Topic

Core material
You should be able to:

Checklist

Supplement material
Comments

You should be able to:

Checklist

Comments

Organisation of the organism

2.1 Cell
structure and
organisation

Describe and compare the
structure of a plant cell with an
animal cell, as seen under a light
microscope, limited to cell wall,
nucleus, cytoplasm, chloroplasts,
vacuoles and location of the cell
membrane
State the functions of the
structures seen under the light
microscope in the plant cell and
in the animal cell

State that the cytoplasm
of all cells contains
structures, limited to
ribosomes on rough
endoplasmic reticulum
and vesicles
State that almost all
cells, except
prokaryotes, have
mitochondria and rough
endoplasmic reticulum
Identify mitochondria
and rough endoplasmic
reticulum in diagrams
and images of cells
State that aerobic
respiration occurs in
mitochondria
State that cells with high
rates of metabolism
require large numbers of
mitochondria to provide
sufficient energy

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Topic

Core material
You should be able to:

2.2 Levels of
organisation

Relate the structure of the
following to their functions:
o ciliated cells – movement of
mucus in the trachea and
bronchi
o root hair cells – absorption
o xylem vessels – conduction
and support
o palisade mesophyll cells –
photosynthesis
o nerve cells – conduction of
impulses
o red blood cells – transport of
oxygen
o sperm and egg cells –
reproduction
Define tissue as a group of cells
with similar structures, working
together to perform a shared
function
Define organ as a structure
made up of a group of tissues,
working together to perform
specific functions
Define organ system as a group
of organs with related functions,
working together to perform
body functions
State examples of tissues,
organs and organ systems from
sections 6 to 16

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2.3 Size of
specimens

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Identify the different levels of
organisation in drawings,
diagrams and images of familiar
material

Identify the different
levels of organisation in
drawings, diagrams and
images of unfamiliar
material

Calculate magnification and size
of biological specimens using
millimetres as units

Calculate magnification
and size of biological
specimens using
millimetres and
micrometres as units

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Movement in and out of cells

3.1 Diffusion

Define diffusion as the net
movement of particles from a
region of their higher
concentration to a region of their
lower concentration down a
concentration gradient, as a
result of their random movement
Describe the importance of
diffusion of gases and solutes
State that substances move into
and out of cells by diffusion
through the cell membrane

State that the energy for
diffusion comes from the
kinetic energy of random
movement of molecules
and ions

Investigate the factors
that influence diffusion,
limited to surface
area, temperature,
concentration gradients
and distance

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3.2 Osmosis

State that water diffuses through
partially permeable membranes
by osmosis

State that water moves in and
out of cells by osmosis through
the cell membrane
Investigate and describe the
effects on plant tissues of
immersing them in solutions of
different concentrations

State that plants are supported
by the pressure of water inside
the cells pressing outwards on
the cell wall

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Define osmosis as the
net movement of water
molecules from a region
of higher water potential
(dilute solution) to a
region of lower water
potential (concentrated
solution), through a
partially permeable
membrane
Explain the effects on
plant tissues of
immersing them in
solutions of different
concentrations by using
the terms turgid, turgor
pressure, plasmolysis
and flaccid
Explain the importance
of water potential and
osmosis in the uptake of
water by plants
Explain the importance
of water potential and
osmosis on animal cells
and tissues
Explain how plants are
supported by the turgor
pressure within cells, in
terms of water pressure
acting against an
inelastic cell wall

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3.3 Active
transport

Define active transport as the
movement of particles through a
cell membrane from a region of
lower concentration to a region
of higher concentration using
energy from respiration

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Discuss the importance
of active transport as a
process for movement
across membranes:
o – e.g. ion uptake
by root hairs and
uptake of glucose
by epithelial cells
of villi and kidney
tubules
Explain how protein
molecules move particles
across a membrane
during active transport

4. Biological molecules

List the chemical elements that
make up:
o carbohydrates
o fats
o proteins
State that large molecules are
made from smaller molecules,
limited to:
o starch and glycogen from
glucose
o cellulose from glucose
o proteins from amino acids
o fats and oils from fatty acids
and glycerol

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Describe the use of:
o iodine solution to test for starch
o Benedict’s solution to test for
reducing sugars
o biuret test for proteins
o ethanol emulsion test for fats
and oils
o DCPIP test for vitamin C
Explain that different
sequences of amino
acids give different
shapes to protein
molecules
Relate the shape and
structure of protein
molecules to their
function, limited to the
active site of enzymes
and the binding site of
antibodies
Describe the structure of
DNA as:
o two strands coiled
together to form a
double helix
o each strand contains
chemicals called
bases
o cross-links between
the strands are formed
by pairs of bases

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State that water is important as a
solvent

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o the bases always pair
up in the same way: A
with T, and C with G
(full names are not
required)
Describe the roles of
water as a solvent in
organisms with respect
to digestion, excretion
and transport

5. Enzymes

Define the term catalyst as a
substance that increases the rate
of a chemical reaction and is not
changed by the reaction
Define enzymes as proteins that
function as biological catalysts
Describe why enzymes are
important in all living organisms
in terms of reaction speed
necessary to sustain life
Describe enzyme action with
reference to the complementary
shape of an enzyme and its
substrate and the formation of a
product (knowledge of the term
active site is not required)

Explain enzyme action
with reference to the
active site, enzymesubstrate complex,
substrate and product
Explain the specificity of
enzymes in terms of the
complementary shape
and fit of the active site
with the substrate

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Investigate and describe the
effect of changes in temperature
and pH on enzyme activity

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Explain the effect of
changes in temperature
on enzyme activity in
terms of kinetic energy,
shape and fit, frequency
of effective collisions
and denaturation
Explain the effect of
changes in pH on
enzyme activity in terms
of shape and fit and
denaturation

Plant Nutrition

6.1 Photosynthesis

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Define photosynthesis as the
process by which plants
manufacture carbohydrates from
raw materials using energy from
light
State the word equation for
photosynthesis: carbon dioxide +
water
glucose + oxygen, in
the presence of light and
chlorophyll

Cambridge IG CSE® Biology 0610

State the balanced
chemical equation for
photosynthesis 6CO2 +
C6H12O6 + 6O2
6H2O
Explain that chlorophyll
transfers light energy
into chemical energy in
molecules, for the
synthesis of
carbohydrates
Outline the subsequent
use and storage of the
carbohydrates made in
photosynthesis

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Investigate the necessity for
chlorophyll, light and carbon
dioxide for photosynthesis, using
appropriate controls
Investigate and describe the
effects of varying light intensity,
carbon dioxide concentration and
temperature on the rate of
photosynthesis, e.g. in
submerged aquatic plants

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Define the term limiting
factor as something
present in the
environment in such
short supply that it
restricts life processes
Identify and explain the
limiting factors of
photosynthesis in
different environmental
conditions
Describe the use of
carbon dioxide
enrichment, optimum
light and optimum
temperatures in
glasshouses in
temperate and tropical
countries
Use hydrogencarbonate
indicator solution to
investigate the effect of
gas exchange of an
aquatic plant kept in the
light and in the dark

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6.2 Leaf structure

Identify chloroplasts, cuticle,
guard cells and stomata, upper
and lower epidermis, palisade
mesophyll, spongy mesophyll,
vascular bundles, xylem and
phloem in leaves of a
dicotyledonous plant

Explain how the internal
structure of a leaf is
adapted for
photosynthesis

6.3 Mineral
requirements

Describe the importance of:
o nitrate ions for making amino
acids
o magnesium ions for making
chlorophyll

Explain the effects of
nitrate ion and
magnesium ion
deficiency on plant
growth

Human Nutrition

7.1 Diet

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State what is meant by the term
balanced diet for humans
Explain how age, gender and
activity affect the dietary needs
of humans including during
pregnancy and whilst breastfeeding
Describe the effects of
malnutrition in relation to
starvation, constipation, coronary
heart disease, obesity and scurvy

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List the principal sources of, and
describe the dietary importance
of:
o carbohydrates
o fats
o proteins
o vitamins, limited to C and D
o mineral salts, limited to
calcium and iron
o fibre (roughage)
o water
Explain the causes and
effects of vitamin D and
iron deficiencies
Explain the causes and
effects of protein-energy
malnutrition, e.g.
kwashiorkor and
marasmus

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7.2 Alimentary
canal

Define ingestion as the taking of
substances, e.g. food and drink,
into the body through the mouth
Define mechanical digestion
as the breakdown of food into
smaller pieces without chemical
change to the food molecules
Define chemical digestion as the
breakdown of large, insoluble
molecules into small, soluble
molecules
Define absorption as the
movement of small food
molecules and ions through the
wall of the intestine into the
blood
Define assimilation as the
movement of digested food
molecules into the cells of the
body where they are used,
becoming part of the cells
Define egestion as the passing
out of food that has not been
digested or absorbed, as faeces,
through the anus
Describe diarrhoea as the loss of
watery faeces
Outline the treatment of
diarrhoea using oral rehydration
therapy

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Describe cholera as a disease
caused by a bacterium

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Explain that the cholera
bacterium produces a
toxin that causes
secretion of chloride ions
into the small intestine,
causing osmotic
movement of water into
the gut, causing
diarrhoea, dehydration
and loss of salts from
blood

Identify the main regions of the
alimentary canal and associated
organs, limited to mouth, salivary
glands, oesophagus, stomach,
small intestine (duodenum and
ileum), pancreas, liver, gall
bladder and large intestine
(colon, rectum, anus)
Describe the functions of the
regions of the alimentary canal
listed above, in relation to
ingestion, digestion, absorption,
assimilation and egestion of food

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7.3 Mechanical
digestion

Identify the types of human
teeth (incisors, canines,
premolars and molars)
Describe the structure of human
teeth, limited to enamel, dentine,
pulp, nerves and cement, as well
as the gums
Describe the functions of the
types of human teeth in
mechanical digestion of food
State the causes of dental decay
in terms of a coating of bacteria
and food on teeth, the bacteria
respiring sugars in the food,
producing acid which dissolves
the enamel and dentine
Describe the proper care of teeth
in terms of diet and regular
brushing

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7.4 Chemical
digestion

State the significance of
chemical digestion in the
alimentary canal in producing
small, soluble molecules that can
be absorbed
State the functions of enzymes
as follows:
o amylase breaks down starch
to simpler sugars
o protease breaks down protein
to amino acids
o lipase breaks down fats to
fatty acids and glycerol
State where, in the alimentary
canal, amylase, protease and
lipase are secreted

State the functions of the
hydrochloric acid in gastric juice,
limited to killing bacteria in food
and giving an acid pH for
enzymes

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Describe the digestion of
starch in the alimentary
canal:
o amylase is secreted
into the alimentary
canal and breaks
down starch to
maltose
o maltose is broken
down by maltase to
glucose on the
membranes of the
o epithelium lining the
small intestine
Describe pepsin and
trypsin as two protease
enzymes that function in
different parts of the
alimentary canal:
o pepsin in the
stomach
o trypsin in the small
intestine

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Explain the functions of
the hydrochloric acid in
gastric juice, limited to
the low pH:
o denaturing enzymes
in harmful
microorganisms in
food
o giving the optimum
pH for pepsin activity
Outline the role of bile in
neutralising the acidic
mixture of food and
gastric juices entering
the duodenum from the
stomach, to provide a
suitable pH for enzyme
action
Outline the role of bile in
emulsifying fats to
increase the surface
area for the chemical
digestion of fat to fatty
acids and glycerol by
lipase

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7.5 Absorption

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Identify the small intestine as the
region for the absorption of
digested food
Explain the significance
of villi and microvilli in
increasing the internal
surface area of the small
intestine
Describe the structure of
a villus
Describe the roles of
capillaries and lacteals in
villi
State that water is absorbed in
both the small intestine and the
colon, but that most absorption
of water happens in the small
intestine

Transport in plants

8.1 Transport in
plants

State the functions of xylem and
phloem
Identify the position of xylem
and phloem as seen in sections
of roots, stems and leaves,
limited to non-woody
dicotyledonous plants

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8.2 Water uptake

Identify root hair cells, as seen
under the light microscope, and
state their functions
State the pathway taken by
water through root, stem and leaf
as root hair cell, root cortex cells,
xylem and mesophyll cells
Investigate, using a suitable
stain, the pathway of water
through the above ground parts
of a plant

8.3 Transpiration

State that water is transported
from the roots to leaves through
the xylem vessels
Define transpiration as loss of
water vapour from plant leaves
by evaporation of water at the
surfaces of the mesophyll cells
followed by diffusion of water
vapour through the stomata

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Explain that the large
surface area of root hairs
increases the rate of the
absorption of water by
osmosis and ions by
active transport

Explain how water
vapour loss is related to
the large surface area of
cell surfaces,
interconnecting air
spaces and stomata
Explain the mechanism
by which water moves
upwards in the xylem in
terms of a transpiration
pull that draws up a
column of water
molecules, held together
by cohesion

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Investigate and describe the
effects of variation of
temperature and humidity on
transpiration rate

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Explain how and why
wilting occurs
Explain the effects of
variation of temperature
and humidity on
transpiration rate

Define translocation in
terms of the movement of
sucrose and amino acids
in phloem:
o from regions of
production (source)
o to regions of storage
OR to regions where
they are used in
respiration or growth
(sink)
Explain that some parts
of a plant may act as a
source and a sink at
different times during the
life of a plant

8.4 Translocation

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Transport in animals

9.1 Transport in
animals

Describe the circulatory system
as a system of blood vessels
with a pump and valves to
ensure one- way flow of blood

Describe the single
circulation of a fish
Describe the double
circulation of a mammal
Explain the advantages
of a double circulation

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9.2 Heart

Name and identify the structures
of the mammalian heart, limited
to the muscular wall, the
septum, the left and right
ventricles
and atria, one-way valves and
coronary arteries
State that blood is pumped away
from the heart into arteries and
returns to the heart in veins

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Name and identify the
atrioventricular and
semilunar valves in the
mammalian heart
Explain the relative
thickness:
o of the muscle wall of
the left and right
ventricles
o of the muscle wall of
the atria compared to
that of the ventricles
Explain the importance of
the septum in separating
oxygenated and
deoxygenated blood
Describe the functioning
of the heart in terms of
the contraction of
muscles of the atria and
ventricles and the action
of the valves

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9.3 Blood and
lymphatic
vessels

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State that the activity of the
heart may be monitored by ECG,
pulse rate and listening to
sounds of valves closing
Investigate and state the effect
of physical activity on the pulse
rate
Describe coronary heart disease
in terms of the blockage of
coronary arteries and state the
possible risk factors as diet,
stress, smoking, genetic
predisposition, age and gender

Explain the effect of
physical activity on the
heart rate
Discuss the roles of diet
and exercise in the
prevention of coronary
heart disease
Describe ways in which
coronary heart disease
may be treated, limited
to drug treatment with
aspirin and surgery
(stents, angioplasty and
by-pass)

Describe the structure and
functions of arteries, veins and
capillaries
Name the main blood vessels to
and from the:
o heart, limited to vena cava,
aorta, pulmonary artery and
pulmonary vein
o lungs, limited to the
pulmonary artery and
pulmonary vein
o kidney, limited to the renal
artery and renal vein

Explain how the
structures of arteries,
veins and capillaries are
adapted for their
functions
State the function of
arterioles, venules and
shunt vessels

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Outline the lymphatic
system in terms of
lymphatic vessels and
lymph nodes
Describe the function of
the lymphatic system in
the circulation of body
fluids and the protection
of the body from
infection
9.4 Blood

List the components of blood as
red blood cells, white blood
cells, platelets and plasma
Identify red and white blood
cells, as seen under the light
microscope, on prepared slides
and in diagrams and
photomicrographs
State the functions of the
following components of blood:
o red blood cells in transporting
oxygen, including the role of
haemoglobin
o white blood cells in
phagocytosis and antibody
production
o platelets in clotting (details
are not required)
o plasma in the transport of
blood cells, ions, soluble
nutrients, hormones and
carbon dioxide

Cambridge IG CSE® Biology 0610

Identify lymphocyte and
phagocyte white blood
cells, as seen under the
light microscope, on
prepared slides and in
diagrams and
photomicrographs
State the functions of:
o lymphocytes –
antibody production
o phagocytes –
phagocytosis
Describe the process of
clotting as the
conversion of fibrinogen
to fibrin to form a mesh
State the roles of blood
clotting as preventing
blood loss and
preventing the entry of
pathogens

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Describe the transfer of
materials between
capillaries and tissue fluid
(details of the roles of
water potential and
hydrostatic pressure are
not required)
10. Diseases and immunity

Define pathogen as a diseasecausing organism
Define transmissible disease as
a disease in which the pathogen
can be passed from one host to
another
State that the pathogen for a
transmissible disease may be
transmitted either through direct
contact, e.g. through blood or
other body fluids, or indirectly,
e.g. from contaminated surfaces
or food, from animals, or from
the air
State that the body has
defences:
o mechanical barriers, limited to
skin and hairs in the nose
o chemical barriers, limited to
mucus and stomach acid
o cells, limited to phagocytosis
and antibody production by
white blood cells
o which can be enhanced by
vaccination

State that antibodies lock
on to antigens leading to
direct destruction of
pathogens, or marking of
pathogens for destruction
by phagocytes
Explain how each
pathogen has its own
antigens, which have
specific shapes, so
specific antibodies which
fit the specific shapes of
the antigens are needed
Define active immunity
as defence against a
pathogen by antibody
production in the body
Explain that active
immunity is gained after
an infection by a
pathogen, or by
vaccination

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Explain the process of
vaccination:
o harmless pathogen
given which has
antigens
o antigens trigger an
immune response by
lymphocytes which
produce antibodies
o memory cells are
produced that give
long-term immunity

Explain the importance of
hygienic food preparation, good
personal hygiene, waste
disposal and sewage treatment
in controlling the spread of
disease

Cambridge IG CSE® Biology 0610

Explain the role of
vaccination in controlling
the spread of diseases
Explain that passive
immunity is short-term
defence against a
pathogen by antibodies
acquired from another
individual, e.g. mother to
infant
State that memory cells
are not produced in
passive immunity
Explain the importance of
passive immunity for
breast-fed infants
State that some diseases
are caused by the
immune system
targeting and destroying
body cells, limited to Type
1 diabetes

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11. Gas exchange in humans

List the features of gas
exchange surfaces in humans,
limited to large surface area, thin
surface, good blood supply and
good ventilation with air
Name and identify the lungs,
diaphragm, ribs, intercostal
muscles, larynx, trachea,
bronchi, bronchioles, alveoli and
associated capillaries

State the differences in
composition between inspired
and expired air, limited to
oxygen, carbon dioxide and
water vapour
Use limewater as a test for
carbon dioxide to investigate the
differences in composition
between inspired and expired air

Name and identify the
internal and external
intercostal muscles
State the functions of the
cartilage in the trachea
Explain the role of the
ribs, the internal and
external intercostal
muscles and the
diaphragm in producing
volume and pressure
changes in the thorax
leading to the ventilation
of the lungs
Explain the differences in
composition between
inspired and expired air

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Investigate and describe the
effects of physical activity on rate
and depth of breathing

12. Respiration
12.1 Respiration

State the uses of energy in the
body of humans: muscle
contraction, protein synthesis,
cell division, active transport,
growth, the passage of nerve
impulses and the maintenance of
a constant body temperature
State that respiration involves the
action of enzymes in cells

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Explain the link between
physical activity and rate
and depth of breathing in
terms of the increased
carbon dioxide
concentration in the
blood, detected by the
brain, causing an
increased rate of
breathing
Explain the role of goblet
cells, mucus and ciliated
cells in protecting the gas
exchange system from
pathogens and particles

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12.2 Aerobic
respiration

Define aerobic respiration as the
chemical reactions in cells that
use oxygen to break down
nutrient molecules to release
energy
State the word equation for
aerobic respiration as glucose +
carbon dioxide +
oxygen
water
Investigate the uptake of oxygen
by respiring organisms, such as
arthropods and germinating
seeds

12.3 Anaerobic
respiration

Define anaerobic respiration as
the chemical reactions in cells
that break down nutrient
molecules to release energy
without using oxygen
State the word equations for
anaerobic respiration in muscles
during vigorous exercise (glucose
lactic acid) and the
microorganism yeast (glucose
alcohol + carbon dioxide)
State that anaerobic respiration
releases much less energy per
glucose molecule than aerobic
respiration

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State the balanced
chemical equation for
aerobic respiration as
C6H12O6 + 6O2
6CO2 + 6H2O
Investigate the effect of
temperature on the rate
of respiration of
germinating seeds

State the balanced
chemical equation for
anaerobic respiration in
the microorganism yeast
as C6H12O6
2C2H5OH + 2CO2

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State that lactic acid
builds up in muscles and
blood during vigorous
exercise causing an
oxygen debt
Outline how the oxygen
debt is removed during
recovery, limited to:
o aerobic respiration of
lactic acid in the liver
o continuation, after
exercise, of fast heart
rate to transport lactic
acid in blood from
muscles to the liver
o continuation, after
exercise, of deeper
breathing supplying
oxygen for aerobic
respiration of lactic
acid

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13. Excretion in humans

State that urea is formed in the
liver from excess amino acids
State that carbon dioxide is
excreted through the lungs
State that the kidneys excrete
urea and excess water and salts
Explain that the volume and
concentration of urine produced
is affected by water intake,
temperature and exercise
Identify on drawings, diagrams
and images, the ureters, bladder
and urethra

Describe the role of the
liver in the assimilation of
amino acids by
converting them to
proteins, including
plasma proteins, e.g.
fibrinogen
Define deamination as
the removal of the
nitrogen-containing part
of amino acids to form
urea
Explain the need for
excretion, limited to
toxicity of urea and
carbon dioxide
Outline the structure of
the kidney, limited to the
cortex, medulla and
ureter

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Outline the structure and
functioning of a kidney
tubule, including:
o the role of the
glomerulus in the
filtration from the
blood of water,
glucose, urea and
salts
o the role of the tubule
in the reabsorption of
all of the glucose,
most of the water and
some salts
o back into the blood,
leading to the
concentration of urea
in the urine
o as well as loss of
excess water and
salts (details of these
processes are not
required)
Explain dialysis in terms
of salt balance, the
maintenance of glucose
concentration and the
removal of urea
Describe the use of
dialysis in kidney
machines
Discuss the advantages
and disadvantages of
kidney transplants,
compared with dialysis

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14. Coordination and response
14.1 Nervous
control in
humans

Describe a nerve impulse as an
electrical signal that passes
along nerve cells called
neurones
Describe the human nervous
system in terms of:
o the central nervous system
consisting of brain and spinal
cord
o the peripheral nervous
system
o coordination and regulation of
body functions
Identify motor (effector), relay
(connector) and sensory
neurones from diagrams
Describe a simple reflex arc in
terms of receptor, sensory
neurone, relay neurone, motor
neurones and effector
Describe a reflex action as a
means of automatically and
rapidly integrating and
coordinating stimuli with the
responses of effectors (muscles
and glands)

Distinguish between
voluntary and involuntary
actions

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Define a synapse as a junction
between two neurones

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Describe the structure of
a synapse, including the
presence of
neurotransmitter
containing vesicles, the
synaptic cleft and
neurotransmitter receptor
molecules
Describe how an impulse
triggers the release of a
neurotransmitter from
vesicles into the synaptic
gap and how the
neurotransmitter diffuses
across to bind with
receptor molecules, in
the membrane of the
neurone after the
synaptic gap, causing the
impulse to continue
State that in a reflex arc
the synapses ensure that
impulses travel in one
direction only
State that many drugs,
e.g. heroin act upon
synapses

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14.2 Sense organs

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Define sense organs as groups
of receptor cells responding to
specific stimuli: light, sound,
touch, temperature and
chemicals
Identify the structures of the
eye, limited to cornea, iris, pupil,
lens, retina, optic nerve and blind
spot
Describe the function of each
part of the eye, limited to:
o cornea – refracts light
o iris – controls how much light
enters pupil
o lens – focuses light onto
retina
o retina – contains light
receptors, some sensitive to
light of different colours
o optic nerve – carries impulses
to the brain
Explain the pupil reflex in terms
of light intensity and pupil
diameter only

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Explain the pupil reflex in terms
of light intensity and pupil
diameter only

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Explain the pupil reflex in
terms of light intensity
and antagonistic action
of circular and radial
muscles in the iris
Explain accommodation
to view near and distant
objects in terms of the
contraction and
relaxation of the ciliary
muscles, tension in the
suspensory ligaments,
shape of the lens and
refraction of light
State the distribution of
rods and cones in the
retina of a human
Outline the function of
rods and cones, limited
to greater sensitivity of
rods for night vision and
three different kinds of
cones absorbing light of
different colours for
colour vision
Identify the position of
the fovea

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14.3 Hormones in
humans

Define a hormone as a chemical
substance, produced by a gland
and carried by the blood, which
alters the activity of one or more
specific target organs
Identify specific endocrine glands
and their secretions, limited to
adrenal glands and adrenaline,
pancreas and insulin, testes and
testosterone and ovaries and
oestrogen
Describe adrenaline as the
hormone secreted in ‘fight or
flight’ situations and its effects,
limited to increased breathing and
pulse rate and widened pupils
Give examples of situations in
which adrenaline secretion
increases

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Discuss the role of the
hormone adrenaline in
the chemical control of
metabolic activity,
including increasing the
blood glucose
concentration and pulse
rate
Compare nervous and
hormonal control systems
in terms of speed and
longevity of action

State the functions of insulin,
oestrogen and testosterone

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14.4 Homeostasis

Define homeostasis as the
maintenance of a constant
internal environment

Name and identify on a diagram
of the skin: hairs, hair erector
muscles, sweat glands,
receptors, sensory neurones,
blood vessels and fatty tissue
Describe the maintenance of a
constant internal body
temperature in humans in terms
of insulation, sweating, shivering
and the role of the brain (limited
to blood temperature receptors
and coordination)

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Explain that homeostasis
is the control of internal
conditions within set
limits
Explain the concept of
control by negative
feedback
Describe the control of
the glucose
concentration of the
blood by the liver and the
roles of insulin and
glucagon from the
pancreas
Outline the symptoms
and treatment of Type 1
diabetes (detail of cells
is not required)

Describe the
maintenance of a
constant internal body
temperature in humans
in terms of vasodilation
and vasoconstriction of
arterioles supplying skin
surface capillaries

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14.5 Tropic
responses

Define gravitropism as a
response in which parts of a
plant grow towards or away from
gravity
Define phototropism as a
response in which parts of a
plant grow towards or away from
the direction from which light is
coming
Investigate gravitropism and
phototropism in shoots and roots

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Explain phototropism
and gravitropism of a
shoot as examples of
the chemical control of
plant growth
Explain the role of auxin
in controlling shoot
growth, limited to:
o auxin made in shoot
tip (only)
o auxin spreads
through the plant
from the shoot tip
o auxin is unequally
distributed in
response to light and
gravity
o auxin stimulates cell
elongation
Describe the use in
weedkillers of the
synthetic plant hormone
2,4-D

15. Drugs
15.1 Drugs

Define a drug as any substance
taken into the body that modifies
or affects chemical reactions in
the body

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15.2 Medicinal
drugs

Describe the use of antibiotics
for the treatment of bacterial
infection
State that some bacteria are
resistant to antibiotics which
reduces the effectiveness of
antibiotics
State that antibiotics kill bacteria
but don’t affect viruses

15.3 Misused drugs

Describe the effects of
excessive alcohol consumption
and abuse of heroin, limited to:
o powerful depressant drugs
o effect on reaction times and
self-control
o addiction and withdrawal
symptoms
o negative social implications,
e.g. crime
State that injecting heroin can
cause infections such as HIV
State that excessive alcohol
consumption can cause liver
damage

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Explain how
development of resistant
bacteria such as MRSA
can be minimised,
limited to using
antibiotics only when
essential and ensuring
treatment is completed
Explain why antibiotics
kill bacteria, but don’t
affect viruses
Explain how heroin
affects the nervous
system, limited to its
effect on the function of
synapses

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State that tobacco smoking can
cause chronic obstructive
pulmonary disease (COPD), lung
cancer and coronary heart
disease
Describe the effects on the gas
exchange system of tobacco
smoke and its major toxic
components, limited to carbon
monoxide, nicotine and tar

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Discuss the evidence
for the link between
smoking and lung cancer

Discuss the use of
hormones to improve
sporting performance,
limited to testosterone
and anabolic steroids

State that the liver is the site of
break down of alcohol and other
toxins
16. Reproduction
16.1 Asexual
reproduction

Define asexual reproduction as a
process resulting in the
production of genetically
identical offspring from one
parent
Identify examples of asexual
reproduction from information
provided

Discuss the advantages
and disadvantages of
asexual reproduction:
o to a population of a
species in the wild
o to crop production

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16.2 Sexual
reproduction

Define sexual reproduction as a
process involving the fusion of
the nuclei of two gametes (sex
cells) to form a zygote and the
production of offspring that are
genetically different from each
other
Define fertilisation as the fusion
of gamete nuclei

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State that the nuclei of
gametes are haploid and
that the nucleus of a
zygote is diploid

Discuss the advantages
and disadvantages of
sexual reproduction:
o to a population of a
species in the wild
o to crop production
16.3 Sexual
reproduction in
plants

Identify and draw, using a hand
lens if necessary, the sepals,
petals, stamens, filaments and
anthers, carpels, style, stigma,
ovary and ovules, of an insectpollinated flower
State the functions of the sepals,
petals, anthers, stigmas and
ovaries
Use a hand lens to identify and
describe the anthers and stigmas
of a wind-pollinated flower
Distinguish between the pollen
grains of insect-pollinated and
wind- pollinated flowers

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Define pollination as the transfer
of pollen grains from the anther
to the stigma

State that fertilisation occurs
when a pollen nucleus fuses
with a nucleus in an ovule
Describe the structural
adaptations of insect-pollinated
and wind- pollinated flowers
Investigate and state the
environmental conditions that
affect germination of seeds,
limited to the requirement for
water, oxygen and a suitable
temperature

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Define self-pollination as
the transfer of pollen
grains from the anther of
a flower to the stigma of
the same flower or
different flower on the
same plant
Define cross-pollination
as transfer of pollen
grains from the anther
of a flower to the stigma
of a flower on a different
plant of the same
species
Discuss the implications
to a species of selfpollination and crosspollination in terms of
variation, capacity to
respond to changes in
the environment and
reliance on pollinators
Describe the growth of
the pollen tube and its
entry into the ovule
followed by fertilisation
(details of production of
endosperm and
development are not
required)

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16.4 Sexual
reproduction in
humans

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Identify and name on diagrams of
the male reproductive system:
the testes, scrotum, sperm ducts,
prostate gland, urethra and penis,
and state the functions of these
parts
Identify and name on diagrams of
the female reproductive system:
the ovaries, oviducts, uterus,
cervix and vagina, and state the
functions of these parts
Describe fertilisation as the
fusion of the nuclei from a male
gamete (sperm) and a female
gamete (egg cell/ovum)

State the adaptive features of
sperm, limited to flagellum and
the presence of enzymes
State the adaptive features of
egg cells, limited to energy stores
and a jelly coating that changes
after fertilisation

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Compare male and
female gametes in terms
of size, structure, motility
and numbers
Explain the adaptive
features of sperm, limited
to flagellum,
mitochondria and
enzymes in the acrosome
Explain the adaptive
features of egg cells,
limited to energy stores
and the jelly coat that
changes at fertilisation

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16.5 Sex hormones
in humans

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Describe the ante-natal care of
pregnant women, limited to
special dietary needs and the
harm from smoking and alcohol
consumption
Outline the processes involved
in labour and birth, limited to:
o breaking of the amniotic sac
o contraction of the muscles in
the uterus wall
o dilation of the cervix
o passage through the vagina
o tying and cutting the
umbilical cord
o delivery of the afterbirth

Describe the function of the
placenta and
umbilical cord in relation to
exchange of
dissolved nutrients, gases and
excretory
products and providing a
barrier to toxins and
pathogens (structural details
are not required)
State that some toxins, e.g.
nicotine, and
pathogens, e.g. rubella virus,
can pass across
the placenta and affect the
fetus
Discuss the advantages and
disadvantages of breast-feeding
compared with bottle-feeding
using formula milk

Describe the roles of
testosterone and oestrogen in
the development and regulation
of secondary sexual
characteristics during puberty
Describe the menstrual cycle in
terms of changes in the ovaries
and in the lining of the uterus

Describe the sites of
production of oestrogen
and progesterone in the
menstrual cycle and in
pregnancy
Explain the role of
hormones in controlling
the menstrual cycle and
pregnancy, limited to
FSH, LH, progesterone
and oestrogen

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16.6 Methods of
birth control in
humans

16.7 Sexually
transmitted
infections
(STIs)

Outline the following methods of
birth control:
o natural, limited to abstinence,
monitoring body temperature
and cervical mucus
o chemical, limited to IUD, IUS,
contraceptive pill, implant and
injection
o barrier, limited to condom,
femidom, diaphragm
o surgical, limited to vasectomy
and female sterilisation

Define sexually transmitted
infection as an infection that is
transmitted via body fluids
through sexual contact
State that human
immunodeficiency virus (HIV) is
an example of an STI
Explain how the spread of STIs
is controlled
Describe the methods of
transmission of HIV
State that HIV infection may lead
to AIDS

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Outline the use of
hormones in
contraception and
fertility treatments

Outline artificial
insemination (AI)
Outline in vitro
fertilisation (IVF)
Discuss the social
implications of
contraception and
fertility treatments

Outline how HIV affects
the immune system,
limited to decreased
lymphocyte numbers
and reduced ability to
produce antibodies

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17. Inheritance
17.1 Inheritance

Define inheritance as the
transmission of genetic
information from generation to
generation

17.2
Chromosomes,
genes and
proteins

Define chromosome as a threadlike structure of DNA, carrying
genetic information in the form of
genes
Define gene as a length of DNA
that codes for a protein
Define allele as a version of a
gene
Describe the inheritance of sex in
humans with reference to XX and
XY chromosomes
Explain that the
sequence of bases in a
gene is the genetic code
for putting together amino
acids in the correct order
to make a specific protein
(knowledge of the details
of nucleotide structure is
not required)
Explain that DNA
controls cell function by
controlling the production
of proteins (some of
which are enzymes),
antibodies and receptors
for neurotransmitters

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Explain how a protein is
made, limited to:
o the gene coding for
the protein remains in
the nucleus
o mRNA molecules
carry a copy of the
gene to the cytoplasm
o the mRNA passes
through ribosomes
o the ribosome
assembles amino
acids into protein
molecules
o the specific order of
amino acids
o is determined by the
sequence of bases in
the
o mRNA (knowledge of
the details of
transcription or
translation is not
required)
Explain that all body cells
in an organism contain
the same genes, but
many genes in a
particular cell are not
expressed because the
cell only makes the
specific proteins it needs

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Define a haploid nucleus
as a nucleus containing a
single set of unpaired
chromosomes, e.g. in
gametes
Define a diploid nucleus
as a nucleus containing
two sets of
chromosomes, e.g. in
body cells
State that in a diploid cell,
there is a pair of each
type of chromosome and
in a human diploid cell
there are 23 pairs
17.3 Mitosis

Define mitosis as nuclear division
giving rise to genetically identical
cells (details of stages are not
required)
State the role of mitosis in
growth, repair of damaged
tissues, replacement of cells and
asexual reproduction

State that the exact
duplication of
chromosomes occurs
before mitosis
State that during mitosis,
the copies of
chromosomes separate,
maintaining the
chromosome number
(details of stages of
mitosis are not required)

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Describe stem cells as
unspecialised cells that
divide by mitosis to
produce daughter cells
that can become
specialised for specific
functions

17.4 Meiosis

Define meiosis as nuclear
division giving rise to cells that
are genetically different (details
of stages are not required)
State that meiosis is involved in
the production of gametes

17.5 Monohybrid
inheritance

Define genotype as the genetic
make-up of an organism in terms
of the alleles present
Define phenotype as the
observable features of an
organism
Define homozygous as having
two identical alleles of a
particular gene

Cambridge IG CSE® Biology 0610

Define meiosis as
reduction division in
which the chromosome
number is halved from
diploid to haploid
resulting in genetically
different cells (details of
stages are not required)
Explain how meiosis
produces variation by
forming new
combinations of
maternal and paternal
chromosomes (specific
details are not required)

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17.5 Monohybrid
inheritance

State that two identical
homozygous individuals that
breed together will be purebreeding
Define heterozygous as having
two different alleles of a
particular gene
State that a heterozygous
individual will not be purebreeding
Define dominant as an allele that
is expressed if it is present
Define recessive as an allele that
is only expressed when there is
no dominant allele of the gene
present
Interpret pedigree diagrams for
the inheritance of a given
characteristic
Use genetic diagrams to predict
the results of monohybrid
crosses and calculate phenotypic
ratios, limited to 1:1 and 3:1
ratios
Use Punnett squares in crosses
which result in more than one
genotype to work out and show
the possible different genotypes

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Explain how to use a test
cross to identify an
unknown genotype

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Explain co-dominance
by reference to the
inheritance of ABO blood
groups – phenotypes
being A, B, AB and O
blood groups and alleles
being IA, IB and Io

Define a sex-linked
characteristic as a
characteristic in which
the gene responsible is
located on a sex
chromosome and that
this makes it more
common in one sex than
in the other
Describe colour
blindness as an example
of sex linkage
Use genetic diagrams to
predict the results of
monohybrid crosses
involving co-dominance
or sex linkage and
calculate phenotypic
ratios

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18. Variation and selection
18.1 Variation

Define variation as differences
between individuals of the same
species
Distinguish between phenotypic
variation and genetic variation
State that continuous variation
results in a range of phenotypes
between two extremes, e.g.
height in humans
State that discontinuous
variation results in a limited
number of phenotypes with no
intermediates, e.g. tongue rolling
Record and present the results
of investigations into continuous
and discontinuous variation
Define mutation as genetic
change
State that mutation is the way in
which new alleles are formed
State that ionising radiation and
some chemicals increase the
rate of mutation

State that phenotypic
variation is caused
by both genetic and
environmental factors

State that discontinuous
variation is mostly
caused by genes alone,
e.g. A, B, AB and O
blood groups in humans

Define gene mutation as
a change in the base
sequence of DNA

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Describe the symptoms
of sickle-cell anaemia
Explain how a change in
the base sequence of
the gene for
haemoglobin results in
abnormal haemoglobin
and sickle- shaped red
blood cells
Use genetic diagrams to
show how sickle-cell
anaemia is inherited
State that people who
are heterozygous (HbS
HbA) for the sickle-cell
allele have a resistance
to malaria
Explain the distribution of
the sickle-cell allele in
human populations with
reference to the
distribution of malaria
(Teaching of human
inherited conditions should
be done with sensitivity at
all times.)

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18.2 Adaptive
features

18.3 Selection

Define adaptive feature as an
inherited feature that helps an
organism to survive and
reproduce in its environment
Interpret images or other
information about a species to
describe its adaptive features

Describe natural selection with
reference to:
o
variation within populations
o
production of many offspring
o
competition for resources
o
struggle for survival
o
reproduction by individuals
that are better adapted to
the environment than others
o
passing on of their alleles to
the next generation

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Define adaptive feature
as the inherited functional
features of an organism
that increase its fitness

Define fitness as the
probability of an organism
surviving and reproducing
in the environment in
which it is found
Explain the adaptive
features of hydrophytes
and xerophytes to their
environments

Describe evolution as the
change in adaptive
features of a population
over time as the result of
natural selection
Define the process of
adaptation as the
process, resulting from
natural selection, by
which populations
become more suited to
their environment over
many generations

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Describe selective breeding with
reference to:
o selection by humans of
individuals with desirable
features
o crossing these individuals to
produce the next generation
o selection of offspring
showing the desirable
features

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Describe the
development of strains
of antibiotic resistant
bacteria as an example
of evolution by natural
selection
State the differences
between natural and
artificial selection
Outline how selective
breeding by artificial
selection is carried out
over many generations
to improve crop plants
and domesticated
animals

19. Organisms and their environment

19.1 Energy flow

State that the Sun is the principal
source of energy input to
biological systems

19.2 Food chains
and food webs

Define a food chain as showing
the transfer of energy from one
organism to the next, beginning
with a producer

Cambridge IG CSE® Biology 0610

Describe the flow of
energy through living
organisms including light
energy from the sun and
chemical energy in
organisms and its
eventual transfer to the
environment

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State that energy is transferred
between organisms in a food
chain by ingestion
Construct simple food chains

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Describe how energy is
transferred between
trophic levels
Define trophic level as
the position of an
organism in a food chain,
food web, pyramid of
numbers or pyramid of
biomass
Explain why the transfer of
energy from one trophic
level to another is
inefficient
Explain why food chains
usually have fewer than
five trophic levels
Explain why there is a
greater efficiency in
supplying plants as
human food, and that
there is a relative
inefficiency in feeding
crop plants to livestock
that will be used as food

Define a food web as a network
of interconnected food chains
Define producer as an organism
that makes its own organic
nutrients, usually using
energy from sunlight, through
photosynthesis
Define consumer as an organism
that gets its energy by feeding
on other organisms

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State that consumers may be
classed as primary, secondary
and tertiary according to their
position in a food chain

Define herbivore as an animal
that gets its energy by eating
plants
Define carnivore as an animal
that gets its energy by eating
other animals
Define decomposer as an
organism that gets its energy
from dead or waste organic
material
Interpret food chains and food
webs in terms of identifying
producers and consumers
Use food chains and food webs
to describe the impacts humans
have through over-harvesting of
food species and through
introducing foreign species to a
habitat
Draw, describe and interpret
pyramids of numbers

Cambridge IG CSE® Biology 0610

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Identify producers,
primary consumers,
secondary consumers,
tertiary consumers and
quaternary consumers as
the trophic levels in food
webs, food chains,
pyramids of numbers and
pyramids of biomass

Draw, describe and
interpret pyramids of
biomass
Discuss the advantages
of using a pyramid of
biomass rather than a
pyramid of numbers to
represent a food chain

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Topic

Core material
You should be able to:

19.3 Nutrient
cycles

Describe the carbon cycle,
limited to photosynthesis,
respiration, feeding,
decomposition, fossilisation and
combustion
Discuss the effects of the
combustion of fossil fuels and
the cutting down of forests on
the carbon dioxide
concentrations in the
atmosphere
Describe the water cycle, limited
to evaporation, transpiration,
condensation and precipitation

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Describe the nitrogen
cycle in terms of:
o decomposition of plant
and animal protein to
ammonium ions
o nitrification
o nitrogen fixation by
lightning and bacteria
o absorption of nitrate
ions by plants
o production of amino
acids and proteins
o feeding and digestion
of proteins
o deamination
o denitrification

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Topic

Core material
You should be able to:

Checklist

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Comments

You should be able to:

State the roles of
microorganisms in the
nitrogen cycle, limited to
decomposition,
nitrification, nitrogen
fixation and denitrification
(generic names of
individual bacteria, e.g.
Rhizobium, are not
required)

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Topic

Core material
You should be able to:

19.4 Population
size

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Define population as a group of
organisms of one species, living
in the same area, at the same
time

Identify and state the factors
affecting the rate of population
growth for a population of an
organism, limited to food supply,
predation and disease

Define community as all
of the populations of
different species in an
ecosystem
Define ecosystem as a
unit containing the
community of organisms
and their environment,
interacting together, e.g.
a decomposing log, or a
lake
Identify the lag,
exponential (log),
stationary and death
phases in the sigmoid
population growth curve
for a population growing
in an environment with
limited resources
Explain the factors that
lead to each phase in the
sigmoid curve of
population growth,
making reference, where
appropriate, to the role of
limiting factors

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Topic

Core material
You should be able to:

Checklist

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Comments

You should be able to:

Discuss the increase in human
population size over the past 250
years and its social and
environmental implications
Interpret graphs and diagrams of
human population growth
20. Biotechnology and genetic engineering

20.1 Biotechnology
and genetic
engineering

State that bacteria are useful in
biotechnology and genetic
engineering due to their rapid
reproduction rate and their ability
to make complex molecules

20.2 Biotechnology

Describe the role of anaerobic
respiration in yeast during
production of ethanol for biofuels
Describe the role of anaerobic
respiration in yeast during breadmaking
Investigate and describe the use
of pectinase in fruit juice
production
Investigate and describe the use
of biological washing powders
that contain enzymes

Cambridge IG CSE® Biology 0610

Discuss why bacteria are
useful in biotechnology
and genetic engineering,
limited to:
o lack of ethical
concerns over their
manipulation and
growth
o genetic code shared
with all other
organisms
o presence of plasmids

Checklist

Comments

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Topic

Core material
You should be able to:

Checklist

Supplement material
Comments

You should be able to:

Checklist

Comments

Investigate and explain
the use of lactase to
produce lactose-free milk
Describe the role of the
fungus Penicillium in the
production of the
antibiotic penicillin
Explain how fermenters
are used in the
production of penicillin
20.3 Genetic
engineering

Define genetic engineering as
changing the genetic material of
an organism by removing,
changing or inserting individual
genes
State examples of genetic
engineering:
o the insertion of human genes
into bacteria to produce
human insulin
o the insertion of genes into
crop plants to confer
resistance to herbicides
o the insertion of genes into
crop plants to confer
resistance to insect pests
o the insertion of genes into
crop plants to provide
additional vitamins

Outline genetic
engineering using
bacterial production of a
human protein as an
example, limited to:
o isolation of the DNA
making up a human
gene using
o restriction enzymes,
forming sticky ends
o cutting of bacterial
plasmid DNA with the
same restriction
enzymes, forming
complementary sticky
ends
o insertion of human
DNA into bacterial
plasmid DNA using
DNA ligase to form a
recombinant plasmid

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Topic

Core material
You should be able to:

Checklist

Supplement material
Comments

You should be able to:

o insertion of plasmid
into bacteria (specific
detail is not required)
o replication of bacteria
containing
recombinant plasmids
which make human
protein as they
express the gene
Discuss the advantages
and disadvantages of
genetically modifying
crops, such as soya,
maize and rice
21. Human influences on ecosystems
21.1 Food supply

State how modern technology
has resulted in increased food
production in terms of:
o agricultural machinery to use
larger areas of land and
improve efficiency
o chemical fertilisers to improve
yields
o insecticides to improve quality
and yield
o herbicides to reduce
competition with weeds
o selective breeding to improve
production by crop plants and
livestock, e.g. cattle, fish and
poultry

Cambridge IG CSE® Biology 0610

Discuss the social,
environmental and
economic implications of
providing sufficient food
for an increasing human
global population
Discuss the problems
which contribute to
famine including unequal
distribution of food,
drought and flooding,
increasing population and
poverty

Checklist

Comments

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Topic

Core material
You should be able to:

Checklist

Supplement material
Comments

You should be able to:

Checklist

Comments

Describe the negative impacts to
an ecosystem of large-scale
monocultures of crop plants
Describe the negative impacts to
an ecosystem of intensive
livestock production
21.2 Habitat
destruction

21.3 Pollution

Describe the reasons for habitat
destruction, limited to:
o increased area for food crop
growth, livestock production
and housing
o extraction of natural
resources
o marine pollution
State that through altering food
webs and food chains, humans
can have a negative impact on
habitats
List the undesirable effects of
deforestation as an example of
habitat destruction, to include
extinction, loss of soil, flooding
and increase of carbon dioxide in
the atmosphere

Explain the undesirable
effects of deforestation
on the environment

State the sources and effects of
pollution of land and water, e.g.
rivers, lakes and the sea, by
insecticides, herbicides and by
nuclear fall-out

Cambridge IG CSE® Biology 0610

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Topic

Core material
You should be able to:

State the sources and effects of
pollution of water (rivers, lakes
and the sea) by chemical waste,
discarded rubbish, untreated
sewage and fertilisers

State the sources and effects of
pollution of the air by methane
and carbon dioxide, limited to the
enhanced greenhouse effect and
climate change

Cambridge IG CSE® Biology 0610

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Comments

You should be able to:

Explain the process of
eutrophication of water
in terms of:
o increased availability
of nitrate and other
ions
o increased growth of
producers
o increased
decomposition after
death of producers
o increased aerobic
respiration by
decomposers
o reduction in dissolved
oxygen
o death of organisms
requiring dissolved
oxygen in water
Discuss the effects of
non-biodegradable
plastics in the
environment, in both
aquatic and terrestrial
ecosystems

Checklist

Comments

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Topic

Core material
You should be able to:

Checklist

Supplement material
Comments

You should be able to:

Checklist

Comments

Discuss the causes and
effects on the
environment of acid rain
State the measures that
are taken to reduce
sulfur dioxide pollution
and reduce the impact of
acid rain
Explain how increases in
carbon dioxide and
methane concentrations
in the atmosphere cause
an enhanced
greenhouse effect that
leads to climate change
Describe the negative
impacts of female
contraceptive hormones
in water courses, limited
to reduced sperm count
in men and feminisation
of aquatic organisms
21.4 Conservation

Define a sustainable resource as
one which is produced as rapidly
as it is removed from the
environment so that it does not
run out

Explain the need to conserve
non- renewable resources,
limited to fossil fuels

Define the term
sustainable development
as development
providing for the needs
of an increasing human
population without
harming the
environment

Cambridge IG CSE® Biology 0610

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Topic

Core material
You should be able to:

State that some resources can
be maintained, limited to forests
and fish stocks
State that products can be
reused or recycled, limited to
paper, glass, plastic and metal
Outline how sewage is treated to
make the water that it contains
safe to return to the environment
or for human use
Explain why organisms become
endangered or extinct, limited to
climate change, habitat
destruction, hunting, pollution
and introduced species
Describe how endangered
species can be conserved,
limited to monitoring and
protecting species and habitats,
education, captive breeding
programmes and seed banks

Cambridge IG CSE® Biology 0610

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Explain how forests and
fish stocks can be
sustained using
education, legal quotas
and re-stocking
Explain that sustainable
development requires:
o management of
conflicting demands
o planning and cooperation at local,
national and
international levels
Explain the risks to a
species if the population
size drops, reducing
variation (knowledge of
genetic drift is not
required)
Explain reasons for
conservation
programmes, to include:
o reducing extinction
o protecting vulnerable
environments
o maintaining
ecosystem functions,
limited to nutrient
cycling and resource
provision, e.g. food,
drugs, fuel and genes

Checklist

Comments

Learner G uide

5: Useful websites
These websites are useful resources to help you study IGCSE Biology.
www.bbc.co.uk/schools/gcsebitesize/biology – A secondary revision source for GCSE exams. The site contains
revision material, tests and SOS teacher. The site also gives references to other relevant websites.
www.clickbiology.com/igcse-biology-2/ – A number of videos, animations and games for revision resources for
IGCSE Biology.
www.skoool.com/ – You will need to select your location before accessing this revision site. There are numerous
quizzes on topics, but like with many general revision sites, check which topics match the Cambridge IGCSE
syllabus.
www.s-cool.co.uk – A revision guide that can be used to complement your learning.
purchon.com/biology/revision.htm – This website has information about revising and lots of useful resources about
GCSE Biology which are also are relevant to IGCSE.
revisioncentral.co.uk/gcse/biology/index.html – There are lots of Biology revision notes on this website including
notes on Classification, Cells, Tissues and Organs and Transportation in Plants.
revisionlink.co.uk/biology/index.html – This site is a portal to lots of useful Biology and other educational web
sites.
www.abpischools.org.uk/ – The Association of the British Pharmaceutical Industry (ABPI) has a numer of useful
interactive revision activities and games on many of the physiology topics. Revision for human physiology.

Apps
itunes.apple.com/gb/app/biology-gcse-revision/id367827149?mt=8
These are new resources which are being developed.
iPad: www.educationapps.co.uk/ipad/revisionguide/gcse/biology/
iPhone: www.educationapps.co.uk/apps/iphone/self-assessment/gcse/biology
Android: www.educationapps.co.uk/apps/android/gcse/science/biology-revision

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6: Mathematical skills
This is a checklist of the mathematical skills you need for your Biology exam. You should tick each box in the
checklist when you know that you have learned the skill. Ask your teacher to explain any skill you’re unsure about.
The ‘Comments’ column is for extra notes and examples.
You can use a calculator for all the exam papers. If your calculator is one that can be programmed, you should make
sure that any information in it is removed before the exam.
You should be able to:

Checklist

Comments

add
subtract
multiply
divide
use averages
use decimals
use fractions
use percentages
use ratios
use reciprocals
recognise standard notation (notation is
putting symbols for numbers e.g. x = 2, y =
5, atomic mass, Z = 12)
use standard notation
understand significant figures and use them
appropriately
use direct proportion (stepwise increases)

The inverse of 4 is ¼ (= 0.25).

use inverse proportion (inverse means turned
upside down)

use numbers to the ‘power of 10’ e.g. 1 × 102
= 100

Your calculator will often show
number to the power of 10
when you do calculations.
Don’t worry too much though
– your calculator does the
work for you.

draw charts

You will be given the data.

draw graphs with line of best fit

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interpret bar graphs
interpret pie charts
interpret line graphs
find the gradient and intercept of a graph
select suitable scales and axes for graphs
make approximations

recall and use the formulas:
area of a rectangle = length × width
volume of a rectangular block = length ×
width × height
area of a circle =

× radius

area of a triangle = base × height / 2
volume of a cylinder =

× radius × height

use and convert metric units into one another
use mathematical and measuring instruments
e.g. ruler, compasses, protractor

understand the meaning of:
angle
curve
circle
radius
diameter
square
circumference
rectangle
parallelogram
diagonal
solve equations of the form x = y + z and x
= yz for any one term when the other two
are known

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7: Appendices
Other important information
The terms used in biology exam papers are given in the sections that follow. It is very important that you know and
understand all of them before you take your exam. You should ask your teacher to explain anything that you’re unsure
about.

Numbers
The decimal point will be placed on the line, e.g. 52.35.
Numbers from 1000 to 9999 will be printed without commas or spaces.
Numbers greater than or equal to 10 000 will be printed without commas. A space will be left between each group
of three whole numbers, e.g. 4 256 789.

Units
The International System of units will be used (SI units). Units will be indicated in the singular not in the plural, e.g. 28
kg.
(a) SI units commonly used in biology are listed below.
N.B. Care should be taken in the use of mass and weight. In most biological contexts, the term mass is
correct, e.g. dry mass, biomass.
Quantity

Name of unit

Symbol for unit

length

kilometre, metre, centimetre,
millimetre, micrometre

km, m, cm, mm, µm

mass

tonne (1000 kg), kilogram,
gram, milligram, microgram

(no symbol), kg, g, mg, µg

time

year, day, hour, minute, second

y, d, h, min, s

amount of substance

mole

mol

kilojoule, joule (calorie is obsolete)

kJ, J

(b) Derived SI units are listed below.
energy

Cambridge IG CSE® Biology 0610

hectare 10

square metre

square decimetre

square centimetre

square millimetre

2
2

Learner G uide
volume

cubic kilometre

cubic metre

cubic decimetre (preferred to dm
3
litre) litre dm (not l)
3
cubic centimetre cm (not ml) cubic
3
millimetre mm
density

kilogram per cubic metre or kg m

–3

gram per cubic centimetre or g cm

–3

(d) Use of Solidus
The solidus (/) must not be used for a quotient, e.g. m / s for metres per second.

Presentation of data
The solidus (/) is to be used for separating the quantity and the unit in tables, graphs and charts, e.g. time/s for time
in seconds.

(a) Tables
(i) Each column of a table will be headed with the physical quantity and the appropriate unit, e.g. time / s.
There are three acceptable methods of stating units:
metres per sec
m per s
–1
ms
(ii) The column headings of the table can be directly rewritten on to the axes of a constructed graph.
(b) Graphs
(i) The independent variable should be plotted on the x-axis (horizontal axis) and the dependent variable
plotted on the y-axis (vertical axis).
(ii) Each axis will be labelled with the physical quantity and the appropriate unit, e.g. time/s.
(iii) The scales for the axes should allow more than half of the graph grid to be used in both directions, and be
based on sensible ratios, e.g. 2 cm on the graph grid representing 1, 2 or 5 units of the variable.
(iv) The graph is the whole diagrammatic presentation. It may have one or several curves plotted on it.
(v) Curves and lines joining points on the graph should be referred to as ‘curves’.
(vi) Points on the curve should be clearly marked as crosses (x) or encircled dots (t:i). If a further curve is
included, vertical crosses (+) may be used to mark the points.
(vii) Large ‘dots’ are penalised. Each data point should be plotted to an accuracy of better than one half of each
of the smallest squares on the grid.
(viii) A best-fit line (trend line) should be a single, thin, smooth straight line or curve. The line does not need to
coincide exactly with any of the points; where there is scatter evident in the data, examiners would expect a
roughly even distribution of points either side of the line over its entire length. Points that clearly don’t fit
should be ignored when drawing the best-fit line.
(c) Numerical results
(i) The independent variable should be plotted on the x-axis (horizontal axis) and the dependent variable plotted
on the y-axis (vertical axis).
(ii) Each axis will be labelled with the physical quantity and the appropriate unit, e.g. time/s.

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(d) Pie Charts
Use pie charts with the sectors in rank order, largest first, beginning at 12:00 and proceeding
clockwise, with no more than six sectors.
(e) Bar Charts
Use bar charts when one of the variables are categories, e.g. percentage of vitamin C in different
fruits. They should be made up of narrow bars of equal width with a gap (not touching) between
each bar.
(f) Histograms
Use histograms to plot frequency graphs with continuous data, e.g., frequency of
occurrence of leaves of different lengths. The blocks should be drawn in order of
increasing or decreasing magnitude and they should be touching.

Taxonomy
Taxonomy is the study of how organisms are arranged into groups. There are seven levels of taxon – kingdom,
phylum, class, order, family, genus and species. These are the rule you need to know:
(a) The Five Kingdoms are:
Prokaryotes (Prokaryotae), including bacteria and blue-green bacteria
Protoctists (Protoctista), including green, red and brown algae and protozoans
Fungi (Fungi)
Plants (Plantae)
Animals (Animalia)
The viruses can’t be fitted into this classificatory system.
(b) The binomial system of naming gives each organism a two-word name. The first word is the generic name
and the second word is the trivial name, e.g. Homo sapiens. The trivial name should never be used without
the generic name as well.
(c) Generic and trivial names are distinguished from the rest of the text either by underlining (when written or
typed) or by being set in italics (in print).
(d) The generic name always takes an initial capital letter. The trivial name can be left off if it is clear which
organsism it is. e.g. Plasmodium, and in these circumstances can stand alone.
(e) The common name should not normally be written with an initial capital letter, e.g. cat and dog. The
exception is Man, where it is the common name for a species where the two sexes are distinguished by the
terms man and woman.
(f) A species is not easy to define but an acceptable general definition is as follows. ‘A group of organisms
capable of interbreeding and producing fertile offspring.’

Genetics
(a) The terms gene and allele don’t mean the same thing.
A gene is a specific length of DNA occupying a position called a locus. A specific function can be assigned
to each gene. An allele is one of two or more different forms of a gene.
(b) Use this standard form of presenting genetic crosses:
Use P for the cross of pure-breeding (homozygous) individuals
Use F1 for the offspring of homozygous parents
Use F2 for the offspring produced by crossing F1 parents.

100

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(c) The format for the course of a genetic cross should be labelled in the following order:
Parental phenotypes
Parental genotypes
Gametes
Offspring genotypes
offspring phenotypes
(d) Chose a letter for the gene so that upper and lower case versions are ease to see the difference, e.g. B and
b. The upper case letter indicates the dominant allele and the lower case letter indicates the recessive allele.
(e) The symbols for gametes should be circled to indicate the discrete nature of each gamete.
(f) Use a checkerboard to show genotypes that can result from random fusion of gametes.
(g) Use the word ‘codominance’ if the alleles are equally dominant, e.g. the AB blood group in humans.

Terminology
Use English terms rather than Latin or Greek terms, e.g. red blood cell (not erythrocyte) unless there is none e.g.
atrium, brinchi, villi.

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101

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