FORM 3 END OF TERM 3 2022 Exam-BIOLOGY PP3 QUESTIONS AND Answers

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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.

1. 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 L_1.

Into the test- tube labeled B add 1ml of L₁ and 1ml of L_2.

Into the test- tube labeled C add 1ml of L₁ and 1ml of L_3.

1. 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)

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)

• 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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1. C                                                                                                                                                   (1mk)

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