SCHOOL: 2017 PREDICTION EXAMINATION Kenya Certificate Of Secondary Education 231 / 1 BIOLOGY PAPER 1
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1 NAME:.. INDEX NO:... SCHOOL: 231/1 BIOLOGY PAPER 1 THEORY 2 HOURS CANDIDATE S SIGNATURE... DATE: PREDICTION EXAMINATION Kenya Certificate Of Secondary Education 231 / 1 BIOLOGY PAPER 1 INSTRUCTIONS TO CANDIDATES Write your name and index number in the spaces provided above. Answer ALL the questions in the spaces provided FOR EXAMINER S USE ONLY. QUESTIONS MAXIMUM SCORE CANDIDATES SCORE
2 1. a) State the function of granum in chroloplasts. (1 mk) b) The diagram below represents a cell organelle. (i) Name the part labeled Y. (ii) State the function of the part labeled X. (1 mk) (1 mk) 2. State two reasons why the stomach wall cannot be digested by the proteolytic enzymes. (2 mks)
3 3. Explain how the following adaptations will reduce the rate of transpiration. a) Sunken stomata (1 mk) b) Leaf folding (1 mk) 4. Antheridia and Archegonia are male and female producing gametes respectively. a) State the plants in which they are found. (1 mk) b) Name the division to which these plants belong. (1 mk) 5. An organelle was magnified 800 times by an electron microscope. Its diameter was 2 millimetres. Calculate the actual diameter in micrometres. (2 mks) 3
4 6. The diagram below shows a specialized cell. a) Identify the cell. 1mk b) State any two structural adaptations of the cell shown in the diagram above that accelerate the rate of nerve impulse transmission. 2mks 7. The diagrams show a clover leaf and one of its cells. A B C E D leaf Not to scale cell The table lists parts of the clover cell. Complete the table by writing one letter (A, B, C, D or E) in each box. 4
5 cell part letter cell wall chloroplast cytoplasm nucleus vacuole (Total 4 marks) 8. A doctor added a few drops of anti B-serum to two samples of blood in a blood test. No agglutination occurred. Name the blood groups of the blood samples. (2mks) 9. The dental formula of a certain animal is I 3 0 C 1 0 P 2 3 M 3 3 (i) Suggest the mode of feeding of the animal (1m) (ii) Give a reason for your answer in part (i) above 5
6 10. In an accident a victim suffered damage of his internal organs, consequently he started having excess glucose in his blood. (a) Which organ was damaged? (1m) (b) Give a reason for your answer. 11. What do you understand by the following terms as they are used in biology (2mks) (i) Anatomy (ii) Physiology 6
7 12. Fig. 1.1 shows a plant in a beaker containing a solution of dye. Fig. 1.2 shows the tissues of the same plant as they would appear if a cross section is taken at X. (a) (i) On Fig. 1.2, shade the tissue that would be most heavily stained by the dye. [1] (ii) Name this tissue 13. An experiment was set up using visking tubing, which was filled with concentrated sugar solution. The free ends were tightly tied to prevent leakage. It was immersed in a beaker containing distilled water. After six hours the observations were made. 7
8 (a) Why did the visking tubing become swollen as shown in after 6 hours. (b) By what physiological process did the water in the beaker turn blue? 14. Identify three shortcomings after a scientist wrote the name of an organism as Zilli Tilapia. (3mks) 15. (a) Name the muscle that controls the moment of the ribcage. 8
9 (b) State three characteristics of a gaseous exchange surface. (3mks) 16.During the oxidation of a certain food substance the respiratory quotient was found to be (i) Name the type of food substrate being oxidized (ii) State two advantages of using the food named in (i) above as a respiratory substrate. (2mks) 17. State three main characteristics of the division spermatophyte. (3mks) 18.(a) Distinguish between a habitat and a niche. (2mks) 9
10 (b) Why is it that two species can occupy the same habitat but cannot occupy the same niche? 19.State three functions of an endoskeleton. (3mks) 20.Name three supportive tissues found in woody stems. (3mks) 21.Which parts of a flower after fertilization develops into: (i) Seed.. (ii) A fruit.. (iii) Testa (3mks) 10
11 22. Outline the role played by each of the following bacteria in the nitrogen cycle. (3mks) (i) Nitrobacter. (ii) Nitrosomonas. (iii) Rhizobium bacteria. 23. State the part of the eye involved in: (3mks) (iv) Colour vision (v) Maintaining the shape of the eyeball (vi) Change in diameter of the lens. 24. What are the limitations of the use of the quadrat method in estimating population? (3mks) 25. What are the functions of the following hormones in the female reproduction. a) Follicle Stimulating Hormone (FSH) 11
12 b) Oxytocin 26. Name the respiratory surfaces of the following organisms: (i) Spider. (ii) Mosquito larvae. (iii) Nile Perch. 27. a) Differentiate between incomplete and complete metamorphosis. Give example in each case. (2mks) b) State the functions of Ecdysone hormone. (2mks) 28. When preparing plant sections to be observed under the microscope: a) Water is used to mount the tissues b) Very thin sections of the plant should be cut 12
13 Give a reason why each of these steps are carried out. (2mks) 29. a) Explain why mosquitoes become resistant to insecticides with time. (2mks) b) Other than the example in (a) above, give two other examples of natural selection in action. (2mks) 13
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