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CANDIDATE
BOTSWANA EXAIM I NATIONS COU NCI L
Botswana General Certificate of Secondary Education
NAME
CENTRE CANDIDATE
NUMBER NUMBER
BIOLOGY 0572t03
Paper 3 October/November 2023
t hour 15 minutes
AdditionalMaterials: AnswerBooklet
INSTRUCTIONS
. Answer all questions.
. Use black or dark blue pen.
o Write your candidate name, Centre number and candidate number in the spaces
provided at the top of this page.
. Write your answer to each question in the space provided.
o Do not use an erasable pen or correction fluid.
. DO NOT WRITE lN ANY BARCODES.
. You may use an HB pencil for any diagrams, graphs or rough working.
INFORMATION
a The total mark for this paper is 70.
a The number of marks for each question or part question is shown in brackets [ ].
a You may lose your marks if you do not show your working.
For Examiner's Use
Section A
Section B
6
a
TOTAL
This document consists of I printed pages.
@ BEC 2023
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2 Examiner's
Use
Section A
Answer all questions in this section in the spaces provided.
1 Fig. 1 .1 shows a root hair cell
nucl
Fig. 1.1
(a) (i) ldentify structures labelled F and G in Fig. 1.1
F." ...........
G ,.. ..
t2l
(ii) State the function of the nucleus.
I1l
(b) Describe how a root hair cell is adapted to perform its function
function.....
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adaptation
l2l
(c) State two differences between a root hair cell and a typical animal cell
1 .. ..
a
2 .....
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3 Examiner's
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2 Fig 2.1 shows a longitudinal cross-section of the human eye
ciliary m
V
U
optlc nerve
Fig.2.1
(a) (i) ldentify structures labelled U and V in Fig. 2.1
u .......
v ..............
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(ii) The Optic nerve contains sensory neurones.
Suggest the function of the optic nerve in the eye.
t1l
(b) Ciliary spasm is a condition in which ciliary muscles fail to relax. The ciliary muscles
remain in a contracted state.
Explain the effect of a ciliary spasm on accommodation
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4 Examiner's
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3 Fig. 3.1 shows an insect belonging to a particulargroup of invertebrate animals
Fig. 3.1
(a) (i) State the name of group of animals that the organism in Fig. 3.1 belongs to
t1l
(ii) State any two structural characteristics that identify this organism for your answer
in (a) (i).
121
(b) (i) The organism shown in Fig. 3.1 can transmit malaria^ Identify the parasite that causes
malaria and describe how the organism can get this parasite.
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5 Examiner's
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(ii) Suggest three different ways of control!ing malaria transmission.
1 .,...
2
3
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4 Fig. 4.1 shows the concentration of carbon dioxide exhaled by an athlete at rest and during
exercise.
exercise staded exercise stopped
80
percentage of
carbon dioxide 6
exhaled air I o/o
4
time / minutes
Fig. 4.1
(a) (i) State the highest percentage of carbon dioxide in air exhaled by the athlete in Fig. 4.1
.. . t1l
(ii) Suggest an explanation for the change in the percentage of carbon dioxide in exhaled
air by the athlete, between 2 and 4 minutes in Fig. 4.1.
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(b) Explain why the breathing rate of an athlete takes time to return to normal after exercise
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For
7 Examiner's
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5 The world constantly experiences challenges. One such challenge is famine.
Famine is when many people in a region are experiencing extreme shortage of food due to
problems such as floods.
(a) Explain how floods may contribute to famine.
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(b) State three other problems that may contribute to famine.
1 . ..
3
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Section B
Answer both questions.
Write your answers on the separate answer paper provided.
6 (a) (i) Explain how vaccination causes the development of immunity. I6l
(ii) Explain why sorne people may not develop immunity to some diseases l2l
(b) Describe the causes, signs and symptoms and treatment of leukaemia. 17l
ffotal: 151
7 (a) Distinguish between the following; I
(i) identical and non-identicaltwins t3l
(ii) sexual and asexual reproduction. 12)
(b) (i) Describe complete dominance with reference to Mendelian experiments in peas t3l
(ii) Explain two reasons why observed ratios may differ from expected ratios in
monohybrid inheritance. l2l
(c) Pesticides are chemicals used to kill pests, however their prolonged use can lead to pests
becoming resistant to the pesticides.
(
Using your knowledge about natural selection, describe how pests can develop
resistance to pesticides. t5l
[Total:15]
Permission to reproduce items where third party owned material protected by copyright is included has been sought and cleared where possible. Every
reasonable effort has been made by the publisher (BEC) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the
publisher will be pleased to make amends at the earliest possible opportunity.
o BEC 2023 0572t03totNt23
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