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Kcse 2008 Paper 2 Question Paper

Kcse 2008 Paper 2

Course:Secondary Level

Exam Year:2008

KCSE 2008 PAPER 2
SECTION A (40 MKS)
Answer all the questions in this section in the spaces provided
1. The figure shows changes that take place during menstrual cycle in human
(a) Name the hormone whose concentrations are represented by curves
F and G ( 2 mks)
(b) State the effects of the hormones named in (a) above on the lining
of the uterus ( 2 mks)
(c) (i) Name the hormone which is released by the pituitary gland
in high concentration on the 14th day of the menstrual cycle
( 1 mk)
(ii) State two functions of the hormone named in (c) (I ) above
( 2 mks)
(d) State the fertile period during the menstrual cycle ( 1 mk)
2 A pea plant with round seeds was crossed with a pea plant that had
Wrinkled seeds
the gene for round seeds is dominant over that for wrinkled seeds
Using letter R to represent the dominant gene state:
(a) The genotype of parents if plant with round seed was
heterozygous ( 2 mks)
(b) The gametes produced by the round and wrinkled seed parents
Round seed parent
Wrinkled seed parent
(c) The genotype and phenotype of F1 generation. Show your working
( 3 mks)
(d) What is a test – cross? ( 1 mk)
.
112
3. The equation below represents a process that takes place in plants
6CO2 + 6H2O?C6H12O6 + 602
(a) Name the process ( 1 mk)
(b) State two conditions necessary for the process to take place ( 2 mks)
(c) State what happens to the end- products of the process ( 5 mks)
4. (a) Give three reasons in each case why support is necessary in
(i) Plants ( 3 mks)
(ii) animals ( 3 mks)
(b) Why is movement necessary in animals ( 2 mks)
5. A freshly obtained dandelion stem measuring 5 cm long was split lengthwise to
obtain two similar pieces
The pieces were placed in solutions of different concentrations in Petri dishes for
20 minutes.
The appearance after 20 minutes is as shown
(a) Account for the appearance of the pieces in solutions L1 and L2( 6 mks)
(b) State the significance of the biological process involved in the
experiment ( 2 mks)
.
113
SECTION B (40 Marks)
Answer question 6 (compulsory) and either questions 7 or 8 in the spaces provided
after questions 8
6. an experiment was carried out to investigate transpiration and absorption of
water in sunflower plants in their natural environment with adequate
supply of water. The account of water was determined in two hour intervals.
The results are as shown in the table below
Time of day Amounts of water in grammes
Transpiration Absorption
(a) Using the same axes, plot graphs to show transpiration and absorption of water in
grammes against time of the day ( 7 mks)
(b) At what time of the day was the amount of water the same for transpiration and
absorption? ( 1 mk)
(c) Account for the shape of graph of:
(i) Transpiration ( 3 mks)
(ii) Absorption ( 3 mks)
(d) What would happen to transpiration and absorption of water if the experiment was
continued till 05 00 hours? ( 2 mks)
(e) Name two factors that may affect transpiration and absorption at any given time
(2 mks)
(f) Explain how the factors you named in (e) above affect transpiration
( 2 mks)
7. Describe the nitrogen cycle ( 20 mks)
8. (a) State four characteristics of gaseous exchange surfaces ( 4 mks)
(b) Describe the mechanism of gaseous exchange in a mammal ( 16 mks)

Kcse 2008 Paper 2 Question Paper

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