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BIOLOGY PAPER 231/2 K.C.S.E 2006

QUESTIONS

Image From EcoleBooks.com1.  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)

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 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)

Image From EcoleBooks.com4.  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)

D.  State two functions of the part labeled M. (2mks)

5.  The diagram below represents human foetus in a uterus.

Image From EcoleBooks.com

 

 

 

 

 

 

 

 

 

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

 

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)




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EcoleBooks | BIOLOGY PAPER 231/2 K.C.S.E 2006 QUESTIONS

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