Name Index No. Candidate s signature Date

Size: px
Start display at page:

Download "Name Index No. Candidate s signature Date"

Transcription

1 Name Index No. Candidate s signature Date 231/1 BIOLOGY PAPER 1 THEORY JULY/AUGUST HOURS KIBWEZI DISTRICT FORM FOUR INTER-SCHOOLS EXAMINATIONS Kenya Certificate of Secondary Education BIOLOGY PAPER 1 2 HOURS INSTRUCTIONS TO CANDIDATES Answer all the questions in this paper in the spaces provided in the question paper. FOR EXAMINERS USE ONLY Questions Total marks Candidates score

2 This paper consists of 10 printed pages Turn Over 1. (i) State the importance of starch in plant cells. (ii) From (i) above name the equivalent in animal cells. (iii) State two functions of hydrochloric acid in digestion in humans. (2mks) 2. The experiment below was set up to investigate a certain physiological process, Beaker visking tubing starch solution iodine solution After 30 minutes the solution in the visking tubing turned blue-black while that in the beaker remained brown, the colour of iodine solution (a) Suggest a physiological process that was being investigated (b) Account for the results after 30 minutes. (3mks)

3 3. (i) Name the structures used for gaseous exchange in: (a) Tadpoles (b) Adult amphibians (ii) (a) What is counter-current flow. (b) What is the importance of counter-current flow. 4. Explain the role of Antidiuretic hormone when there is less water in human body. (3mks) 5. (a) Explain how the following prevent self-pollination. (i) Protandry (ii) Self sterility

4 (b) What is the physiological significance of having testes outside the body of a human male (2mks) 3 6. Study the diagram below and answer the questions that follow. (a) Identify the above bone (b) Name the region of the body from where it was obtained (c) Give one adaptation of the bone above to its functions. 7. Explain how continental drift is an evidence of evolution (3mks)

5 8. State one survival value of each of the following in plants. (a) Phototropism in shoots. (b) Geotropism in roots 9. (a) The diagram below represents an experiment that was set up to investigate a certain process in plants 4 (i) Name the process that was being investigated (ii) Account for the swelling in diagram 2

6 (b) State the reasons for the following adaptation of the xylem vessels. (i) Narrow and long (ii) Lack of cross walls 10. Name the enzyme, the vitamin and the metallic ion required in the clotting of blood. (3mks) 11. Study the reaction below Sucrose + water (a) Name the process A B 5 Glucose + Fructose A B (b) State the form in which energy is stored in living cells. (c) State the reason why lipids are not used as the main respiratory substrate in living cells 12. (a) Define the term binomial nomenclature.

7 (b) Give two reasons why binomial nomenclature is necessary (2mks) 13. The diagram below represents a nerve cell (a) Identify the nerve cell 6 (b) (i) Give a reason for your answer in (a) above (ii) On the diagram show by use of an arrow the direction of flow of the nerve impulses. 14. State two environmental problems that are solved by studying Biology as a subject (2mks) 15. The following statement represents an analogy of gene mutation.

8 Intended message Actual message (i) Eat the meat Heat the meat (ii) This is my team This is my tea (a) Identify the type of gene mutation illustrated in (i) (ii) (b) Name one type of chromosomal mutation that leads to change in chromosome structure 16. (a) During an ecological study a student came across an animal with the following characteristics: 4 pairs of walking legs 2 body parts Simple eyes Name the : (i) Phylum (ii) Class (b) Name the division of kingdom plantae with the following spore producing bodies (i) Sori (ii) Sporangium 17. What is meant by natural selection (2mk) (a) Differentiate between the apical meristem and the cambium (2mks) (b) State the role of the following in germination: (i) Hypocotyl in epigeal germination

9 (ii) Coleoptile in hypogeal germination 19. (a) What is a test cross (b) List any one disorder in human blood due to gene mutation 20. (i) State the role of each of the following in photosynthesis. (2mks) (a) Light (b) Chlorophyl (ii) What is the adaptive value of a thick cuticle on a leaf State the function of the following parts of a light microscope. (a) Objective lens

10 (b) Diaphragm 22. Name the enzyme in red blood cells that speeds up the dissolving of carbon (iv) oxide to form carbonic acid 23. State two ways in which the cell membrane is adapted to its function (2mks) 24. (a) What is the role of the following bacteria in the nitrogen cycle (i) Denitrifying bacteria (ii) Nitrifying bacteria (b) Give two reasons as to why biological control is preferred to chemical control in the control of pests and parasites. (2mks)

11 9 25. The following equation represents aerobic respiration C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O + Energy (i) Work out the respiratory quotient. (2mks) (ii) State the importance of respiratory quotient (2mks) 26. Name the section of the Nephrone where the following take place: (i) Ultrafiltration (ii) Reabsorption of sodium chloride (iii) Effects of Antidiuretic hormone (ADH)

12 ANSWERS: Order a copy of answers from NB> We charge Kshs. 100 ONLY to meet website, e-resource compilation and provision costs