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231/1 Biology P1 Question Paper

231/1 Biology P1

Course:Biology

Exam Year:2011

NAME………………………………………………………CLASS…… ………..
INDEX NO………………………………………..DATE: ………………………..

231/1
BIOLOGY P1
THEORY
JUNE 2011
TIME: 2 HOURS

KASSU JET EXAMINATIONS
Kenya Certificate of Secondary education
Biology Paper I
June 2011
2 Hours

Instructions

• Write your name, class and admission number in the space provided above.
• Write the date of the examination in the space provided above.
• Answer all the questions in the spaces provided.

For Examiner’s use only

QUESTION MAXIMUM SCORE CANDIDATE’S SCORE

1 - 26

80

This paper consists of 11 printed pages.
Candidates should check the question paper to ascertain that all the pages are printed as indicated and no questions are missing.
1. A part of a strand of DNA molecule was found to have the following base sequence:
A C T G G A

What is the sequence?

(a) On the complimentary DNA strand? (1mk)
……………………………………………………………………………………………..
(b) On the m- RNA strand? (1mk)
……………………………………………………………………………………………..
2. Study the figure below then answer questions that follow.

(a) Identify the structure. (1mk)
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(b) Name the part labelled A and B. (2mks)

A …………………………………………………………………………………….

B ……………………………………………………………………….. …………..

3. (a) What is immunity? (1mk)

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(b) Name the type of immunity developed when one.
i) Gets infected and recovers. (1mk)

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ii) Receives antiserum. (1mk)

……………………………………………………………………………………………..
4. Study the figure below then answer questions that follow.

(a) Identify the stage of cell division. (1mk)

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

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(c) What is the next process that will follow the one shown above? (1mk)

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5. The diagram below shows the structure of a motor neutron.

(a) Name the part labelled A and B. (2mks)

A ………………………………………………………………………………
B ………………………………………………………………………………
(b) Using an arrow on the diagram, indicate the direction of impulse. (1mk)

6. (a) What are sex – linked genes? (1mk)

……………………………………………………………………………………………..
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(b) Name two sex-linked traits in human beings. (2mks)
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7. a) What is respiratory quotient? (1mk)

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b) A certain fat has the molecular formula C57 H110 O6. Calculate the RQ for its
complete oxidation. (2mks)

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8. Name three types of muscles found in the human body stating where each is found.
(3mks)

(i)………………………………………………………………………………………….

(ii)………………………………………………………………………………………....

(iii)…………………………………………………………………………………………

9. (a) State the role of the follicle stimulating hormone in menstrual cycle. (2mks)

……………………………………………………………………………………………..
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(b) Name the source of progesterone hormone:

(i) Before four months of pregnancy. (1mk)

……………………………………………………………………………………………..
(ii) After four months of pregnancy. (1mk)

……………………………………………………………………………………………..
10. a) Name a characteristic that is common to all members of phylum Arthropoda. (1mk)

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b) State two features that are used to divide members of phylum Arthropoda into classes. (2mks)
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11. State the importance of gaseous exchanges in living organisms. (3mks)

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12. The table below shows the approximate concentration of various components in blood plasma, glomerular filtrate and urine of a healthy human.

Component Plasma Glomerular Urine
(%) filtrate (%) (%)

Glucose 0.1 0.1 0
Plasma Protein 7.0 0 0
Urea 0.02 0.02 2.0

(a) Name the process responsible for absence of glucose in urine. (1mk)

……………………………………………………………………………………………..

b) Explain the absence of plasma protein in both glomerular filtrate and
urine. (2mks)

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c) Why is the concentration of urea in urine much higher than in
glomerular filtrate? (1mk)

……………………………………………………………………………………………..
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13. State the role each of the following organisms in nitrogen cycle.
(a) Nitrifying bacteria. (1mk)

……………………………………………………………………………………………..
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(b) Nitrogen fixing bacteria. (1mk)

……………………………………………………………………………………………..
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(c) Denitrifying bacteria. (1mk)

………………………………………………………………………………………………
……………………………………………………………………………………………….
The experiment below was set up to investigate a certain aspect of photosynthesis.

(a) What aspect of photosynthesis was being investigated? (1mk)
……………………………………………………………………………………………..
(b) What is the importance of sodium hydroxide in the experiment? (1mk)
……………………………………………………………………………………………..
(c) Leaf A and B were tested for starch separately. What would be the results?
(2mks)
A ………………………………………………………………………………….

B ………………………………………………………………………………….

14. Name the feeding structures in:
a) Saprophytic Fungi. (1mk)
…………………………………………………………………………………………
b) Parasitic Fungi. (1mk)
……………………………………………………………………………………………..
15. a) Define the term cell physiology. (1mk)
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b) How is the cell membrane adapted to its functions? (2mks)

……………………………………………………………………………………………..
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16. Two green leaves K and L were immersed in a beaker of warm water and the beaker placed in sunlight. Bubbles of gas were seen to form on the surface of the leaves. In leaf K, bubbles formed only on the upper surface of the leaf while on leaf L, more bubbles formed on the lower surface than on the upper surface.

a) Why do the air bubbles form on the leaf surface? (1mk)

……………………………………………………………………………………………..
……………………………………………………………………………………………..
b) From the observation, what conclusion can be drawn about the natural habitat of
the plants from which the leaves were obtained? (2mks)

Leaf K ……………………………………………………………………………

Leaf L ……………………………………………………………………………

17. (a) Define the term Zoology. (1mk)

……………………………………………………………………………………………..
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(b) What two external features can be used to separate the organisms below into two
groups? (2mks)

R

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18. ( a) What are vestigial organs? (1mk)

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b) Explain why Lamarck’s theory rejected. (2mks)

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19. The cells shown below were obtained from different parts of a young root tip.

Identify the zone from which each cell was obtained. (3mks)

A ………………………………………………………………………………………..

B …………………………………………………………………………........................

C ………………………………………………………………………………………….

20. (a) State two important functions of the xylem tissue of terrestrial plants. (2mks)

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(b) State two ways in which xylem vessel is adapted to its functions. (2mks)

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21. What is the modification in the cells below that enable them to perform their function more efficiently? (3mks)

a)

……………………………………………………………………………………………..
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b)

……………………………………………………………………………………………..
……………………………………………………………………………………………..
c)

……………………………………………………………………………………………..
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23. State the role of the following hormones in digestion:
a) Gastrin. (1mk)

………………………………………………………………………………………………………………………………………………………………………………………………
b) Secretin. (1mk)

……………………………………………………………………………………………..
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c) Cholecystokinin. (1mk)

……………………………………………………………………………………………..
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24. An experiment was set to investigate a certain aspect of response. A seedling was put on a
horizontal position as shown in figure A below. After 24 hrs, the set up was as shown in
figure B.

(a) Name the response exhibited. (1mk)

……………………………………………………………………………………………..

b) Explain the curvature of the roots downwards. (2mks)

……………………………………………………………………………………………….
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25. (a) What are the two main components of an ecosystem? (2mks)

……………………………………………………………………………………………..
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(b) Name the organisms that form the biological environment for Schistosoma spp.
(2mks)

……………………………………………………………………………………………..
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26. (a) Name a hormone whose deficiency may lead to excretion of glucose in urine. (1mk)

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(b) What name is given to a mechanism that restores a deviation back to normal in
mammalian body? (1mk)

……………………………………………………………………………………………..

231/1 Biology P1 question paper

231/1 Biology P1 Question Paper

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