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KCSE CLUSTER TESTS 23

Biology Paper 1

1.

Define the following terms:

a) Cytology

……………………………………………………………………………………………….

b) Microbiology

2 marks

2.

Other than anchorage, state two other functions of rhizoids of mosses. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ……………………………………………………………………………………………….

2 marks

3.

a) Why is it necessary to use a sharp razor blade while preparing sections to be viewed under a light microscope? ……………………………………………………………………………………………….

b) Give the functions of the following organelles.

i) Centrioles

………………………………………………………………………………………………. ……………………………………………………………………………………………….

ii) Nucleolus

………………………………………………………………………………………………. ……………………………………………………………………………………………….

4 marks

4.

Define osmosis

………………………………………………………………………………………………. ……………………………………………………………………………………………….

1 marks

5.

State the role diaphragm;

a) In the light microscope

……………………………………………………………………………………………….

b) During ventilation in man

2 marks

6.

Describe what happens during the dark stage of photosynthesis.

………………………………………………………………………………………………. ……………………………………………………………………………………………….

2 marks

7.

State one function of the following structures in mammals:

a) Caecum

………………………………………………………………………………………………. ……………………………………………………………………………………………….

b) Spleen

………………………………………………………………………………………………. ……………………………………………………………………………………………….

2 marks

8.

The following diagram represents a plant division spermatophyta.

a) Name the sub-division to which the above plant belongs.

………………………………………………………………………………………………. ……………………………………………………………………………………………….

b) Give two observable characteristics of this sub – division.

……………………………………………………………………………………………….

3 marks

9.

a) State two differences between marginal and axile placentation.

………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ……………………………………………………………………………………………….
b) What is the role of follicle stimulating hormone (FSH) in female menstrual cycle.
………………………………………………………………………………………………. ……………………………………………………………………………………………….

3 marks

10.

State any two factors in a seed that cause dormancy.

………………………………………………………………………………………………. ……………………………………………………………………………………………….

2 marks

11.

. Name the products of anaerobic respiration in

a) Plants:

……………………………………………………………………………………………….

b) Animals:

……………………………………………………………………………………………….

2 marks

12.

Explain how stigma in wind pollinated flower is adapted to its function

2 marks

13.

The diagram below represents a transverse section of a plant organ

a) Name the plant organ from which the section was obtained.

……………………………………………………………………………………………….

b) i) Name the class to which the plant organ was obtained.

……………………………………………………………………………………………….

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

………………………………………………………………………………………………. ……………………………………………………………………………………………….
c) Name the part labelled N

4 marks

14.

Name two components of blood that are not present in glomerular filtrate

2 marks

15.

Give three factors that determines the amount of energy a human being requires in a day.

3 marks

16.

Oil can be app lied on the stagnant water two control the spread of malaria.

How can this practice control the spread of malaria? ……………………………………………………………………………………………….

1 marks

17.

During a strenuous exercise the chemicals process represented by the equation below takes place in the human muscle cells.

a) Name the process represented above. ……………………………………………………………………………………………….

b) Name substance X

……………………………………………………………………………………………….

3 marks

18.

. a) State the function of piliferous layer in roots.

………………………………………………………………………………………………. ……………………………………………………………………………………………….

b) Explain why cell walls of root hairs are thin.

………………………………………………………………………………………………. ……………………………………………………………………………………………….

c) State one way in which food moves in the phloem naturally.

……………………………………………………………………………………………….

3 marks

19.

The diagram below represents a human foetus in a uterus

a) Name the part labelled S.

……………………………………………………………………………………………….

b) Name two features that enable the structure labelled P carry out its function. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ……………………………………………………………………………………………….

c) State the role of the part labelled R.

……………………………………………………………………………………………….

4 marks

20.

State three ways in which a respiratory surface is adapted to its function

3 marks

21.

Examine the diagram below and answer the questions that follow.

a) Name the structures labelled A and B and the cell labelled H.

A………………………………………………………………………………………………. B……………………………………………………………………………………………….

Cell H………………………………………………………………………………………….

b) How is the cell labelled X adapted to its function.

………………………………………………………………………………………………. ……………………………………………………………………………………………….

5 marks

22.

a) It is necessary for large animals to have elaborate transport system. Explain ………………………………………………………………………………………………. ………………………………………………………………………………………………. ……………………………………………………………………………………………….

b) Explain why amoeba does not require transport system.

………………………………………………………………………………………………. ……………………………………………………………………………………………….

3 marks

23.

State three mechanisms that ensure cross pollination takes place in flowering plants

3 marks

24.

What is apical dominance?

2 marks

25.

When are the following hormones secreted:

a) Insulin

b)Antiduretic hormone.

2 marks

26.

A form three class set-up an experiment below. Make a careful observation and answer questions that follow

If the set up was kept at a room temperature for a week. a) What was the aim of the experiment? ………………………………………………………………………………………………. ……………………………………………………………………………………………….

b) Account for the results at the end of experiment.

………………………………………………………………………………………………. ……………………………………………………………………………………………….

3 marks

27.

State the role of saprophytes in an ecosystem

……………………………………………………………………………………………….

2 marks

28.

. An experiment was set up as shown below.

The set up was left for 30 minutes. a) Name the physiological process that was being investigated

b) State the expected results.

………………………………………………………………………………………………. ……………………………………………………………………………………………….
c) Explain your answer in (b) above

………………………………………………………………………………………………. ……………………………………………………………………………………………….

5 marks

29.

a) State two ways in which plants get rid of their nitrogenous wastes. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ……………………………………………………………………………………………….

b) State two adaptations of the nephron of a desert animal.

……………………………………………………………………………………………….

3 marks

30.

a) State two ways in which plants get rid of their nitrogenous wastes.

2 marks

31.

Name three plant cells that contain chloroplasts.

………………………………………………………………………………………………. ………………………………………………………………………………………………. ……………………………………………………………………………………………….

2 marks

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