231/3
BIOLOGY FORM THREE
TIME: 13/4 HOURS
END OF TERM THREE EXAMINATIONS 2022 FORM 3
Name: …………………………………………………………………… Adm no ……..…………. Class……………..
INSTRUCTIONS TO CANDIDATES:
- Answer ALL the questions
- Answers should be written in the spaces provided
Below is a photograph of an adult human jaw with teeth. Study the diagram and answer the questions that follow.

- State the mode of nutrition in man. (1mk)
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- Name the type of teeth labeled I and III. (2mks)
I:………………………………………………………………………………………………………
III:……………………………………………………………………………………………………
- Name the parts of teeth labeled H and J. (2mks)
H:……………………………………………………………………………………..………..…….
J:…………………………………………………………………………………………………..….
- Identify one distinguishing feature between teeth labeled II and IV. (1mk)
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- State one function of tooth IV. (1mk)
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- Write the dental formula from the jaw shown in the photograph. (1mk)
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- Explain why tooth I would be more prone to dental carries than tooth III, (2mks)
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- Use the hand lens provided to observe specimen K and answer the questions that follow.
- (i) In the space below draw a fully labeled diagram of representative part of the specimen. (5mks)
(ii) Calculate the magnification of your drawing. (2mks)
- Identify:
- The Kingdom (1mk)
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- The Division, to which the specimen belongs. (1mk)
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- Give a reason for your answer in b (ii) above. (1mk)
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- State the functions of any two parts labeled in your diagram. (2mks)
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- What is the mode of reproduction in the specimen? (1mk)
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- Explain the significance of colour observed in the specimen M. (2mks)
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- You are provided with solutions labeled L1, L2 and L3. Note that L3 is the same as L2 except that L3 has been boiled.
Label three test- tubes A, B and C.
Into the test- tube labeled A add 1ml of solution L1.
Into the test- tube labeled B add 1ml of L1 and 1ml of L2.
Into the test- tube labeled C add 1ml of L1 and 1ml of L3.
- Withdraw a drop from test – tube A and place it on a white tile. To the drop add one drop of iodine solution. Record your observation in the table below. (3 mks)
Test – tube | observation | conclusion |
A | ||
B | ||
C |
Repeat the procedure with contents in test – tubes B and C. Record your observations in the table.
Place the three test –tubes labeled A, B and C into a water bath at 370C.
NB. Ensure that the temperature of the water bath does not fall below 350C or exceed 380C
- After 30 minutes, test the contents of each of the test – tubes labeled A, B and C following the procedure in (a) above. Record your observations in the table below. (6 mks)
Test – tube | observation | conclusion |
A | ||
B | ||
C |
- Why was test – tube labeled A included in the experiment? (1mk)
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- (i) suggest the identity of solution L2 (1mk)
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(ii) Give a reason for your answer in (d) i above. (1 mk)
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- Suggest a part of the alimentary canal in the body of a mammal where the process being investigated in the experiment would take place. (1mk)
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- Account for the results at the end of the experiment in the test – tube labeled.
- B (1mk)
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- C (1mk)
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