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Biology Paper 231/2 K.C.S.E 2006 Question Paper

Biology Paper 231/2 K.C.S.E 2006

Course:Secondary Level

Exam Year:2006

BIOLOGY PAPER 231/2 K.C.S.E 2006
QUESTIONS
1. The diagram below represents bones at a joint found in the hind limb of a
mammal.
a) Name the bones labeled XY and Z (3mks)
b) i) Name the substance found in the place labeled W. (1mk)
ii) State the function of the substance named in (b) (i) above.
(1mk)
c) Name the structure that joins the bones together at the joint.(1mk)
d) State the differences between ball and socket joint and the one
illustrated in the diagram above. (1mk)
e) Name the structure at the elbow that performs the same function
as the same function as the patella.(1mk)
2. a) Name two disorder in human caused by gene mutation. (2mks)
b) Describe the following chromosomal mutations. (2mks)
a. Inversion
b. Translocation.
c) In mice the allele for black fur is dominant to the allele for brown fur.
What percentage offspring would have brown fur form across between
heterozygous black mice? Show your working.
Use letter B to represent the allele for black colour. (4mks)
3. a) Distinguish between pyramid of numbers and pyramid of biomass.
(2mks)
b) Give three reasons for loss of energy from one trophic level to another in
the food chain. (3mks)
4. The diagram below represents a traverse section through a plant organ
A. From which plant organ was the section obtained? (1 mk)
B. Give two reasons for your answer in (a) above. (2mks)
C. Name the parts labeled J,K and L. (3mks)
.
92
D. State two functions of the part labeled M. (2mks)
5. The diagram below represents human foetus in a uterus.
a) Name the part labeled S. (1mk)
b) i) Name the types of blood vessels found in the structure labeled Q. (2mks)
ii) State the differences in composition of blood found in the vessels
named in (b)(i) above. (2mks)
c) Name two features that enable the structure labeled P carry
out its function. (2mks)
d) State the role of the part labeled R (1mk)
SECTION B
Answer question 6 (compulsory) in the spaces provided and either question
7 or 8 in the spaces provided and either question 8.
6. An experiment was carried out to investigate the effect of hormones on growth of
lateral buds of three pea plants
The shoots were treated as follows:
Shoot A – Apical bud was removed.
Shoot B – Apical bud was removed and gibberellic acid placed on the cut shoot.
Shoot C – Apical bud was left intact.
The length of the branches developing from lateral buds were determined at regular
intervals.
The results obtained are as shown in the table below.
Time in days Length of branches in millimeters
Shoot A Shoot B Shoot C
0 3 3 3
2 10 12 3
4 28 48 8
6 50 9 14
8 80 120 20
10 118 152 26
.
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a) Using the same axes, draw graphs to show the lengths of branches against time.
(8mks)
b)i) What was the length of the branch in shoot B on the 7th day? (1mk)
ii) What would be the expected length of the branch developing from shoot A on the
11th day? (1mk)
c) Account for the results Obtained in the experiment (6mks)
d) Why was shoot C included in the Experiment? (1mk)
e) What is the importance of gibberellic acid in agriculture? (1mk)
f) State two physiological processes that are brought about by the application of
gibberellic acid on plants. (2mks)
7. Describe how human kidney functions (20mks)
8. Describe how water moves from the soil to the leaves in a tree. (20mks)

Biology Paper 231/2 K.C.S.E 2006 Question Paper

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