Name ………………………..…………………………
Index No. ..………………………...…….….
School ………………………………………………...
Candidate’s signature: …………………..
Date: ……………………………………….
231/1
BIOLOGY
Paper 1
(Theory)
July / August – 2008
Time: 2 Hours
HOMA BAY/SUBA DISTRICTS MOCK EXAMINATION - 2008
Kenya Certificate of Secondary Education (K.C.S.E)
231/1
BIOLOGY
Paper 1
(Theory)
July / August – 2008
Time: 2 Hours
INSTRUCTION TO CANDIDATES
 Write your name, index number and school in the space provided above.
 Sign and write the date of examination in the spaces provided.
 Answer all questions in the spaces provided.
FOR EXAMINER’S USE ONLY.
QUESTIONS
MAXIMUM SCORE
1 - 28
80
CANDIDATES SCORE
This paper consists of 8 printed pages.
Candidates should check the question paper to ensure that all the
© 2008 Hosec District Examination Panel
Biology 231/1
1
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Pages are printed as indicated and no questions are missing.
1.
a) Name the type of body symmetry found in mammals.
(1 mk)
b) One of the external features observed in plants is leaf arrangement on the stem. Name any two
kinds of leaf arrangements.
2.
(2 mks)
a) Differentiate between prokaryotic and eukaryotic cells.
(1 mk)
b) (i) Identify the organelle represented by the diagram below.
Identity
(1 mk)
(ii) State the function of the organelle identified in 2 b) (i) above.
3.
(1 mk)
a) State the role of active transport in animal nutrition.
(1 mks)
b) Give two factors which affect active transport.
(2 mks)
4.
Name the causative agent of cholera.
(1 mk)
5.
The chemical equation below represents a physiological process that takes place in living
organisms.
R
C6H12O6 + C6H12O6
6.
Q
C12H22O11 +
(i) Name the process R.
(1 mk)
(ii) Name substance Q
(1 mk)
The diagram below is of a cell obtained from one of the specialized tissues in plant leaves.
Nucleus
Chloroplasts
(i) Name the tissue from which the cell was obtained.
(1 mk)
(ii) State two ways in which the tissue named in 6. (i) above is adapted to its functions. (2 mks)
7.
The biochemical process illustrated below takes place in the human alimentary canal.
Lactose
Galactose + Glucose
a) In which part of the alimentary canal does the process occur?
(1 mk)
b) Why must lactose be broken down into glucose and galactose?
(1 mk)
c) State two ways in which glucose is utilized in the body.
(2 mks)
8.
State three adaptations of the xylem vessel.
(3 mks)
9.
a) What is the difference between an O positive blood and O negative blood?
(1 mk)
b) State two functions of blood in mammals other than transport of substances.
© 2008 Hosec District Examination Panel
Biology 231/1
2
(2 mks)
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10.
In an experiment, some germinating seeds were placed in a large airtight flask and left for four
days.
a) What changes were expected in the composition of gases in the flask on the fifth day. (2 mks)
b) Give reasons for your answer in a) above.
11.
(1 mk)
State three adaptive features which the bucal cavity of a frog has in common with the alveoli of
the lungs of a human being.
12.
(3 mks)
The diagram below represents a portion of the kidney tubule. Study it and answer the question
below.
a) Name the part labeled A and B.
(2 mks)
A
B
b) Name the region of the kidney in which the portion represented by the above diagram is
13.
located.
(1 mk)
c) What is the function of the part marked A.
(1 mk)
State three ways by which an endothermic animal would respond to low environment
temperature.
14.
(3 mks)
An organism was found to posses the following features; an exoskeleton, two pairs of antennae,
bilateral symmetry and jointed appendages.
Giving a reason in each case, state the phylum and class in which the organism belongs. (4 mks)
Phylum
Reason
Class
Reason
15.
16.
17.
Give three assumptions that are made when using capture recapture method to estimate the
population of organisms.
(3 mks)
a) Name the part of the flower in which pollen grains are formed.
(1 mk)
b) Name the two nuclei found in pollen grains.
(2 mks)
a) State the function of epididymis in the human male reproductive system.
(1 mk)
b) Name two glands in the male reproduction system whose secretions are released into the sperm
duct.
18.
(2 mks)
The diagram below shows a germinating seed
© 2008 Hosec District Examination Panel
Biology 231/1
3
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Ground level
19.
20.
21.
22.
23.
(i) Identify the type of germination represented by the diagram above.
(1 mk)
(ii) Explain how the type of germination named in 18(i) above takes place.
(2 mks)
a) State two advantages of metamorphosis to insects.
(2 mks)
b) Name one hormone which controls metamorphosis in insects.
(1 mk)
a) Distinguish between heterozygous and homozygous individuals.
(2 mks)
b) What is a chiasma?
(1 mk)
State the functions of the following hormones.
(i) Secretin
(1 mk)
(ii) Gastrin
(1 mk)
a) Differentiate between homologous and analogous structures as used in evolution.
(2 mks)
b) Give the meaning of somatic mutation.
(1 mk)
When shoots of young plants are exposed to unidirectional light they bend towards light.
(i) Name the type of response exhibited by such young shoots.
(1 mk)
(ii) Explain the cause of the observation above.
(2 mks)
24.
Explain two ways in which halophytes overcome the physiological drought facing them. (2 mks)
25.
a) Name the part of the eye in which the light sensitive cells are located.
(1 mk)
b) List the two types of sensory cells found in the part named in 25 a) above.
(2 mks)
a) State two ways by which plants compensate for their inability to locomot.
(2 mks)
b) Explain why herbaceous plants do not grow to greater heights.
(1 mk)
27.
State two effects of eutrophication.
(2 mks)
28.
Name three types of joints found in the human skeleton.
(3 mks)
26.
© 2008 Hosec District Examination Panel
Biology 231/1
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END