EXAMINATION NUMBER: ___________________________ SCHOOL:_______________________

BALAKA DISTRICT SECONDARY SCHOOLS

2025 JUNIOR CERTIFICATE OF EDUCATION MOCK EXAMINATIONS

BIOLOGY
100 Marks
DATE: Friday, April 4 Subject Number: J022
Time Allowed: 2hours
8:00 -10:00am

Instructions
1. This paper contains 12 printed pages.
Please check. Question Tick if Do not write
Number answered in these
2. Before beginning to answer these columns
questions fill in your Examination 1-20
Number at the top of each paper 21

3. This paper contains three sections: A, B 22

and C. Answer all the questions in each 23
section.
24

4. Section A should be answered by 25

encircling the correct answer. Section B
26
and C should be answered in the
spaces provided. 27

28
5. Hand in the completed question paper
29
when time is called to stop writing
30
6. In the table provided on this page, tick
31
against the question number you have
answered 32

33

©BALAKA-2025

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 EXAMINATION NUMBER: ___________________________ SCHOOL:_______________________

Multiple-choice (20 marks)

Answer all questions
Instruction: Encircle the letter corresponding to the correct answer

1. Which of the following parts of a plant cell 4. What type of joint is shown in Figure 2?
regulates materials that enter or leave the
A. Gliding
cell?
B. Sutures
A. cell wall
C. Ball and socket
B. nucleus
D. Hinge
C. cytoplasm
5. Which of the following describes
D. cell membrane
arachnids?
2 A food solution was put on a white piece of
A. have four pairs of legs
paper during an investigation and a
translucent spot was observed. B. Body divided into three parts
Which of the following food nutrient was C. have six legs
present in the food?
D. have antannae
A. carbohydrates
6. Which of the following modes of food
B. proteins preservation slows down the growth of
bacteria?
C. lipids
A. Heating
D. vitamin C
B. Freezing
Figure 1 is a diagram of a joint, Use it to
answer questions 3 and 4 C. Salting
D. Canning

Figure 2 is an invertebrate. Use it to

answer questions 7 and 8

3. What is the name of the part marked W?

7. To which group of invertebrate does it
A. Cartilage belong?
B. Synovial membrane A. Coelentarates
C. Tendon B. Crustaceans
D. Ligament C. Molluscs
D. Nematodes

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 EXAMINATION NUMBER: ___________________________ SCHOOL:_______________________

8 Which of the following best describes this Figure 3 is an eye defect. Use it to answer
questions 12 and 13
invertebrate?
A. Has a pair of tentacles
B. Has exoskeleton
C. Has pincers
D. Has segmented body
12. Which of the following is the name given
9. Which part of the skin is made up of dead
cells? to the eye defect shown in the figure?
A Epidermal layer A. Short sight
B. Granular layer B Long sight
C. Malpighian layer C. Astigmatism
D. Cornified layer D. Cataract
10. Which of the following describes inverse 13. How is the eye defect corrected?
relationship between variables?
A. Replacing the lens with a new one
A. One variable decreases as the other
B. Making an incision to remove some
variable increases
liquid
B. One variable increases as the other
C. Wearing convex lens spectacles
variable also increases
D. Wearing concave lens spectacles
C. One variable increases as the other
variable remain constant 14. Which of the following pairs of worms
affects the lungs in their life cycle
D. One variable is constant as the other
changes (i) Bilharzia worm
11. A millipede coils when it is touched. (ii). Thread worms
Which of the following characteristics of (iii) Hook worms.
living things are displayed by the
millipede? (iv) Round worms

A. Response and growth A. (i) and (ii)

B. Irritability and movement B. (i) and (iii)

C. Growth and irritability C. (ii) and (iii)

D. Sensitivity and irritability D. (iii) and (iv)

15. Which of the following mineral salts is
used in formation of red blood cells?
A. Iodine B. Iron
C. Phosphorus D. Potassium

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 EXAMINATION NUMBER: ___________________________ SCHOOL:_______________________

16. Which of the following non flowering 19. Which of the following capacities of
plants reproduces by fragmentation? measuring cylinder would be more
appropriate for measuring 23 millilitres of
A. Algae
alcohol.
B. Ferns
A 10 millilitres
C. Mosses
D. Liverworts B. 30 millilitres
Table 1 shows number of chloroplasts from C. 75 millitres
different parts of a plant and the amount of oxygen
D. 100 milliltres
produced from each one of them. Use it to answer
questions 17 and 18. 20 Figure 4 is a diagram of part of human
digestive system.
Table 1
Part of Number of Amount of
plant Chloroplast Oxygen
W 5 0.32
X 16 1.22
Y 11 0.93
Z 7 0.53

17. Which of the following plant parts is likely

to produce a large amount of glucose?
Which of the following secretion is stored in part
A. W S?
B. X
A. trypsin
C. Y
B. pepsin
D. Z
C. amylase
18. What is the relationship between number
of chloroplasts and the amount of oxygen D. bile
produced?
A. The lower the number of
chloroplast the higher the amount
of oxygen produced
B. The higher the number of
chloroplast the lower the amount of
oxygen produced
C. The higher the number of
chloroplast the higher the amount
of oxygen produced
D. The amount of oxygen produced
does not depend on the number of
chloroplast.

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 EXAMINATION NUMBER: ___________________________ SCHOOL:_______________________

Section B: 50 Marks
Answer all question by filling in the spaces provided

21. Figure 5 shows a common laboratory apparatus

Figure 5

a. Name the parts marked A and B

A ________________________________________________________(1mark)
B ________________________________________________________(1mark)
b. Give the function of B _______________________________________(1mark)
c. Calculate the total magnification of the microscpe if the eye piece lens is X25 and
that of the objective lens is X40. Show all your working.

(2marks)
22. a. Mention two ways of treating anaemia
________________________________________________________________
________________________________________________________________
(2marks)
b. Give any two functions of blood plasma
_________________________________________________________________
_________________________________________________________(2 marks)

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 EXAMINATION NUMBER: ___________________________ SCHOOL:_______________________

23. a. State any two structures that help a tapeworm to attach itself to walls of the
intestines
_________________________________________________________________
_________________________________________________________ (2 marks)
b. Explain any one way of preventing bilharzia worm infestation
________________________________________________________________
_________________________________________________________(2 marks)
c. Mention any one mineral salt that is stored in bones
_________________________________________________________(1mark)
24. In an investigation, it was established that the following nutrients in groundnut were
expressed in percentages 48% is fats, proteins forms 28% while 18% is carbohydrates
and moisture forms 6%.
Represent this information in a table of two columns

(5marks)
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 EXAMINATION NUMBER: ___________________________ SCHOOL:_______________________

25. Figure 6 is a diagram showing a type of injury to bones as W and X

a. (i) Which diagram represent a dangerous injury?

__________________________________________________________(1mark)
(ii). Give two reasons for your answe in a (i) above
____________________________________________________________________
____________________________________________________________________
(2 marks)
b. Explain any one first aid step for sprains
_____________________________________________________________________
_____________________________________________________________________
(2 marks)
26. a. Give any two risky situations related to sexually transmitted diseases.
____________________________________________________________________
____________________________________________________________________
(2 marks)
b. State any one effect of HIV and AIDS on each of the following
(i) the family
_____________________________________________________________________
_____________________________________________________________________
(2 marks)
(ii) the nation
_____________________________________________________________________
_____________________________________________________________________
(2 marks)

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 EXAMINATION NUMBER: ___________________________ SCHOOL:_______________________

27. Figure 6 is a shows the human brain and other parts associated with it.

a. Name the parts marked F and G

F: _______________________________________________________(1 mark)
G: ______________________________________________________ (1 mark)
b. State any two observable characteristics part labelled E.
_________________________________________________________________
_________________________________________________________________
(2 marks)
c. Give any two effects of alcohol on the nervous system
_________________________________________________________________
_________________________________________________________________
28. Two ptted plants were covered by separate transparent plastic bag. A petri dish
of sodiun hydroxide was put in one set up and another containing sodium
bicarbonate in the other and left in sunlightr. After 6hour a leaf from each plant
was detached then tested for starch.

a. State the aim of the investigation of the investigation.

_______________________________________________________________
_______________________________________________________________
(2 marks)
b. What is the use of each of the following
(i) Sodium hydroxide
___________________________________________________ (1 mark)
(ii) Sodium bicarbonate
____________________________________________________(1 mark)
c. Give the observation in the investigation
(i) Leaf from a potted plant with sodium hydroxide
____________________________________________________ (1mark)
(ii) Leaf from a potted plant with sodium bicarbonate
____________________________________________________ (1mark)
Page 8 of 12
 EXAMINATION NUMBER: ___________________________ SCHOOL:_______________________

29. a Figure 7 shows some common leaf arrangements in plants R and S.

(i) Identify the types of leaf arrangement R and S

R: __________________________________________________(1mark)
S: __________________________________________________(1mark)
(ii) Describe the importance of leaf arrangements mentioned in
a(i) above
________________________________________________________
_____________________________________________________(1mark)
b. Mention any two differences between structure of monocotyledonous stem
and a dicotyledonous stem
Monocotyledonous stem Dicotyledonous stem
(i)

(ii)
(2 marks)
30. Describe the function of phagocytes
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
(3marks)

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 EXAMINATION NUMBER: ___________________________ SCHOOL:_______________________

Section C
Essays
Answer all the questions in this section

31. Describe functions of any five parts of the ear

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______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
(10marks)

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 EXAMINATION NUMBER: ___________________________ SCHOOL:_______________________

32. Describe any five ways of preventimg typhoid outbreak in your community.
______________________________________________________________________
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______________________________________________________________________
______________________________________________________________________
(10marks)

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 EXAMINATION NUMBER: ___________________________ SCHOOL:_______________________

33. Describe an experiment to show the effect of temperature on the growth of

microorganisms. In your answer include materials, procedure expected results and
conclusion.
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(10marks)
END OF QUESTION PAPER

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