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KCSE CLUSTER TESTS 19

Biology Paper 3

00
1.

. You are provided with three pieces of a specimen labelled H. Examine the specimen.

a) i) What part of plant is specimen H? (1mk)

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ii) Give a reason for your answer in (a) i) above. (1mk)

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b) Crush the three pieces of the specimen in a mortar using the pestle provided. Rub a little of the crushed material on the filter paper provided and pass it over a Bunsen flame taking care not to burn it. i) Record your observation. (1mk) ...................................................................................................................................

ii) Give a conclusion for the observation made in (b) (i) above. (1mk)

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c) Add 15ml of distilled water to the rest of the crushed material in the mortar. Stir thoroughly to obtain a uniform mixture. Decant the extract into the boiling tube provided. Divide the extract into three portions of 2ml each. Using the reagents provided test for the food substances present in the extract. Record the food substances being tested, your procedures, observations and conclusions in the table below.

4 marks

2.

a) Attached and titled ‘ photograph for question

2 (a)’ is a photograph showing the human urinogenital system.
I) Name the parts labelled i) W...................................................................................(1mk)

ii) X....................................................................................(1mk)

II) State one function in each case of parts labelled .

i) U.....................................................................................(1mk)

ii) Y.....................................................................................(1mk)

III) Name one hormone in each case that is produced by the parts labelled:

i) S.......................................................................................(1mk)

ii) V......................................................................................(1mk)

IV) Give one homeostatic function of the part labelled T (1mk) ............................................................................................................
b) The attached and titled ‘photograph for question 2

(b)’ shows the different bones in a rabbit skeleton
Name the vertebrate that are represented by the bones labelled:
i) A...................................................................................(1mk)

ii) C...................................................................................(1mk)

iii) G...................................................................................(1mk)

I. State how the bones labelled B and E are adapted to their function.

i) B......................................................................................(1mk)

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ii) E........................................................................................(1mk)

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II. Name the joints that are found at the regions labelled D and F.

i) D..........................................................................................( ½ mk)

ii) F.........................................................................................( ½ mk)

III. Give one difference between the joints named in III (i) and (ii) above (1mk) ............................................................................................................. .............................................................................................................

IV. Name the muscles that are found in the blood vessels. (1mk)

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15 marks

3.

(a) The diagram attached and titled ‘diagram for question

3(a)’ shows a set up that was prepared by a group of two students in a practical lesson.
i) Name the apparatus that was being used in the experiment. (1mk) ...........................................................................................................................

ii) What physiological process were the students investigating? (1mk) ...........................................................................................................................

iii) Give one precaution that should be observed while setting up the experiment. (1mk) ........................................................................................................................... ...........................................................................................................................

iv) Give a reason for the precaution named in

(a) (iii) above. (1mk)

...........................................................................................................................

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v) State one environmental factor that would increase the rate of movement of the air bubble. (1mk) ........................................................................................................................... ...........................................................................................................................

vi) Explain how the factor named in (a) (v) above increases the rate of movement of the air bubble. (1mk) ........................................................................................................................... ...........................................................................................................................

vii) Suggest a control experiment for this investigation. (1mk) ........................................................................................................................... ...........................................................................................................................
b) The diagram attached and titled ‘diagram for question

3(b)’ represents a set up that was prepared by a group of form four students in a biology project work.

i) Name the apparatus that was being used in the experiment. (1mk) ..........................................................................................................................

ii) Name the plant response that was being investigated in the project. (1mk) ..........................................................................................................................

iii) After three weeks, the students observed that the shoot of the plant continued to grow horizontally as shown in the diagram. Account for this observation. (3mks) ........................................................................................................................... ...........................................................................................................................

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12 marks

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