IC MUKUYU GIRLS/SC LWANGA-BOTWA

JOINT EVALUATION
KCSE 2024
231/3

BIOLOGY
PAPER 3 (PRACTICAL)
TIME: 1¾ HOURS

CODE……………………………………………… SIGN………………………..

DATE…………………………………………….

Kenya Certificate of Secondary Education.

INSTRUCTIONS TO CANDIDATES
1. Write your code,date and sign in the spaces provided above.
2. Spend the first 15 minutes of the time allocated to read through the question paper.
3. Answer all the questions in the spaces provided only.
4. Wrong spelling especially of biological terms will be penalized.

FOR EXAMINER’S USE ONLY

QUESTION MAXIMUM SCORE CANDIDATE’S SCORE
1 18
2 10
3 12

TOTAL 40

1
1. (a) You are provided with solution Q, Solution W, Visiking tubing and a thread. Divide solution
Q and W into two halves in separate beakers. Use one half for Procedure 1 and second half for
Procedure II.
Procedure 1
 Using reagents provided and one half of solution Q, carry out tests to determine the food substance
present in solution Q.
 Record the procedure, observations and conclusions in the table below.
 Repeat the same procedure using the half of solution W. (10mks)

Test Food Procedure Observation Conclusion

Solution
Starch

Reducing
sugars
Q

2
Procedure II
(Clean and rinse properly any of the beakers that contained Solution W or Solution Q for use in this
procedure)
 Tie one end of visking tubing provided with a thread tightly.
 Measure about 5ml of solution Q into the visking tubing (Stir the solution thoroughly before
use).
 Tie the other end tightly to ensure that there is no leakage.
 Immerse the visking tubing and its content into a beaker containing solution W.
 Allow it to stand for 20 minutes.
 After 20 minutes empty the content of the visking tubing into a clean empty beaker.
b) Use the solution that was in the visking tube to test for starch and reducing sugars. Record the
observations and conclusions in the table below:
Test Observations Conclusions

Starch test

Reducing sugars test

(4mks)
i) Name the physiological process being investigated in the experiment. (1mark)
………………………………………………………………………………………………………
ii) Which structure in the living organism is represented by the visking tubing? (1mark)
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iii) Account for the observation made in the table (b) above. (2marks)
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3
2 a) Study the photograph below. The specimen had been placed in adequate light at a horizontal
position for one week.

i) What was the aim of this experiment? (1 mark)

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ii) What would be the result if seedling is placed on a working klinostat? (1 mark)
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iii) Explain how the growth curvature occurred. (3 marks)

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4
b) Study the Photographs below and answer the questions that follows :

Photo E Photo F

i) Name the type of relationship in Photograph E and F:

Photograph E ………………………………………………………………………. (1mk)

Photograph F ……………………………………………………………………… (1mk)

ii)What is the importance of the relationship taking place in Photograph E. (1mk)

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iii) Using observable features only explain two ways in which the flower is adapted for the activity
taking place in Photograph F. (2mks)
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5
3. The photographs below shows bones obtained from different regions of a mammalian body. The
photographs are in different views.

Anterior view of bone A Dorsal lateral view of Bone B

Anterior view of bone C

a) Identify the bones. (3 marks)

A……………………………………………………………
B……………………………………………………………
C……………………………………………………………

b) Name the regions from which bone B was obtained from. (1 marks)
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c) State two distinguishing features of the bone in photograph labeled B. (2 marks)

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6
d) State the significance of the part labeled T in the photograph of bone A. (1 mark)
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e) With reason state the type of joint formed at the distal and proximal ends of specimen C.
(4 marks)
i) Distal end ……………………..……………………………………………………….
Reason
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ii) Proximal end. ……………………..………………………………………………………

Reason
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f) Name the bone that articulates with the proximal end of the bone in photograph labelled C.
(1 mark)
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