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Biology Paper 231/1 K.C.S.E 2000 Questions Question Paper

Biology Paper 231/1 K.C.S.E 2000 Questions

Course:Secondary Level

Exam Year:2000

BIOLOGY PAPER 231/1 K.C.S.E 2000
QUESTIONS
1. What is the function of the following cells in the retina of human eye ? Cones
2. Give a reason why two species in ecosystems cannot occupy the same niche.
3. State two ways in which some fungi are beneficial to humans
4. State two ways in which some fungi are beneficial to humans.
5. State the importance of osmo-regulation in organisms
6. Give a reason why lumbar vertebrae have long and broad transverse process
7. Give reason why each of the following is important in the study of evolution:
a) Fossils records
b) Comparative anatomy.
8. Why is oxygen important in the process of active transport in cells?
9. State two advantages of metamorphosis to the life of insects.
10. Explain how birds of prey are adapted to obtaining their food.
SECTION B
11. The diagram below represents a section of a leaf.
(b) Name the parts labeled X, and Y
(c) Using arrows indicate on the diagram the direction of flow of water during
the transpiration stream
(d) State two ways in which the leaf is suited to gaseous exchange
12. The chart below represents the result of successive crosses, staring with redflowered
plants and white flowed plants and in which both plants are pure
breeding.
Parental genotypes: Red flowers x white flowers
First final generation
Selfed
Second final generation
3 red flowers: 1 white flower
3: 1
(a) What were parental genotype? Use letter R to represent the gene for red
colour and r for white colour
(b) (i) What was the colour of the flowers in the first filial generation?
(ii) Give a reason for your answer in b (i) above
(c) If 480 red flowered plants were obtained in the second filial generation,
how many F2 plants and white flowers? Show your working.
13. The temperature of a person was taken before, during and after taking a cold
bath. The results are shown in the graph below
(a) Explain why the temperature fell during bath
(b) What changes occurred in the skin that enabled the body temperature to return to
normal?
14. (a) Name the crop infested by phytophthora infestans and the disease it
causes
Crop / Disease
(b) State four control measures against the disease
15. The concentration of the lactic acid in blood during and after an exercise was
determined. The results are shown in the graph below
(a) (i) By how much did the lactic acid increase at the end of 13 minutes?
(ii) After how many minutes was the lactic acid concentration 71mg/
100cm3?
(iii) What would be the concentration of lactic acid at the 60th minute?
(b) Give a reason for the high rate of production of lactic acid during the
Exercise
(c) Give a reason for the decrease in the concentration of lactic acid after the
exercise
16. (a) What is the significance of sexual reproduction?
(b) State three advantages of asexual reproduction
17. The numbers of different types of animals supported by a square kilometer
in two terrestrial ecosystems are shown in the table below
Type of ecosystem Type of animal Number of animals
supported per sq. km
Acacia savannah Domestic animals
Cattle
Goat
Sheep
7
30
10
Bush land Wild games
Thomsons’s gazelles
Eland
Wildebeest
Domestic animals
Cattle
Goats
Sheep
Wild game
Thomson’s gazelles
Eland
Wildebeest
450
20
60
2
15
5
200
12
10
(a) (i) Which domestic animal is better adapted to both ecosystems?
(ii) Give a reason why the animal named in (a) (i) above is better adapted to the
two ecosystems.
(b) Why are cattle and sheep fewer in the bush land than in the savannah?
(c) (i) Name suitable methods that were used to estimate the population of:
Domestic animals
Wild animals
(ii) Give a reason why the method named for wild animals in (c) (i) above is
suitable
(d) state three methods which could be used to determine the diet of wild animals
in an ecosystem
(e) Name four biotic factors that could have regulated the animal population in both
ecosystems
(f) State four human activities that affect population of animals in game parks
(g) What is the importance of national park to a nation?
18. describe the role of hormones in the human menstrual cycle
19. how are leaves of mesophytes suited to their functions

Biology Paper 231/1 K.C.S.E 2000 Questions Question Paper

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