Our country, our future 2 HOURS

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1 Our country, our future NAME:. STREAM SENIOR two Biology Exam 2 2 HOURS INSTRUCTION TO CANDIDATES This paper s consists of three sections; A, B and C. Attempt all questions in both sections A and B, and any one question from section C Answers to section A; should be given by circling the most correct alternative. Answers to section B should be written in the spaces provided. Answers to section C should be written on the answer sheet provided. FOR EXAMINER S USE ONLY SECTION A B C MARKS 1

2 P.T.O SECTION A (25MARKS) 1. Rate of substance Conversion ph The figure above is a graph showing the effect of increasing ph on the rate of conversion of a substance by a digestive enzyme. The enzyme is most likely to be A. Lipase B. Trypsin C. Salivary amylase D. Pepsin 2. The chisel shaped structure of incisor is suitable for A. Tearing B. Cutting C. Chewing D. Grinding 3. Which one of the following is a characteristic of class insect? A. Cutineous outer skeleton C. Two pairs of wings B. Jointed limbs D. Three body parts 4. Which of the following are end products from digestion of cane sugar? A. Sucrose and maltose C. Maltose and galactose B. Glucose and fructose D. Fructose and Galactose 5. Controlled feeding on food rich in vitamin A may improve A. Calcium deposition C. Night vision B. Number of red blood cells D. Healing of wounds 2

3 6. Which of the following diseases are all transmitted by mosquitoes? A. Elephantiasis, river blindness and yellow fever B. Malaria, Elephantiasis and river blindness C. Yellow fever, river blindness and malaria D. Yellow fever, Malaria, elephantiasis 7. In grasses, the anthers hang out below the flower and the stigma is held out above the anthers. The importance of this arrangement is to A. improve the chances of pollination B. minimize waste of pollen grains C. encourage cross pollination D. encourage self pollination 8. Which one of the following is correct about nutrition n a Rhizopus? A. Digestion of food occurs outside the organism B. Digestion of food is intra cellular C. It makes its own food D. It does not produce enzymes 9. When 160cm 3 of water was added to 200cm 3 of soil, the volume of the mixture was 280cm 3. What was the percentage of air in the soil sample? A. 20% B. 40% C. 60% D. 80% 10. Figure 2 is a transverse section of a dicotyledonous root. W Y X Which one of the parts labeled is responsible for the construction of mineral salts and water? A. W B. X C. Y D. Z 11. Which one of the following secretions does not play a digestive role in the alimentary canal? Z 3

4 A. Pepsin B. Rennin C. Trypsin D. Lipase 12. The leaf in figure 3 is modified for A. Absorption of nutrients C. Photosynthesis B. Reproduction D. Water storage 13. Which of the following parts of a flower are essential for fertilization? A. Filament, style and petal B. Petal, receptacle C. Ovary, anther and stigma D. Filament sepal and receptacle 14. Which one of the following is the mode of feeding of a mould? A. Holozoic C. Autotrophic B. Saprophytic D. Parasitic 15. Which of the following foods is rich in iron? A. Milk B. Cheese C. Liver D. Butter 16. The bacteria which convert Ammonia into nitrates are called A. Putrefying bacteria C. Denitrifying bacteria B. Nitrifying bacteria D. Nitrogen fixing bacteria 17. Which of the following classes has the highest number of insect? A. Crustacea B. Arachnida C. Insecta D. Myriapoda 18. Which one of the following relationships is an example of mutualism? A. Tapeworm living in human gut B. Bacterial living in the gut of a cow C. Ticks living on the skin of a dog 4

5 D. Plasmodium living in human blood 19. Which one of the following types of fruits pineapple? A. Drupe C. Indehiscent fruit B. Multiple fruit D. Berry 20. The following conditions are all a result of deficiency of vitamins of the B group except. A. Night blindness C. Pellagra B. Beriberi D. Pernicious anaemia 21. Rotation of crops improves fertility of the soil by preventing A. Rain water from carrying away top soil B. Wind from blowing away top soil C. Mineral salts from being drained out of top soil D. A particular mineral from being exhausted from the soil 22. Why is enzyme pepsin secreted in an inactive form? A. Inactive pepsin can only break down proteins in alkaline medium B. Inactive pepsin is more efficient at digestion C. Active pepsin would digest the cells that produce it D. Active pepsin is denatured by acidic medium 23. A student used a hand lens to observe an ant. The actual length of the ant is 0.6cm. On observing the ant through the hand lens it was 6.8cm long. What was the magnification of the image? A. X7.2 B. X6.2 C. X11.33 D. X Which of the following is not a function of soil air? A. Provides oxygen for root respiration B. Provides nitrogen for nitrogen fixing bacteria C. Used by soil micro-organisms D. Used in flocculation of clay 25. Strong heating of a soil sample to red hot is aimed at removing 5

6 A. Oxygen C. Organic matter B. Nitrogen D. Water SECTION B (40 MARKS) 26. The table below shows the effect of temperature on the activity of amylase on starch. Six test tubes each containing a mixture of starch and amylase were placed in water baths maintained at 0 0 C, 10 0 C, 20 0 C, 30 0 C, 40 0 C, 50 0 C and allowed to stand. Study the table and answer the questions that follow. Test tube Temperature (0 0 C) Time taken for starch digestion (Minutes) Starch still present after 60minutes Starch still present after 60minutes (a) How does temperature affect the action of amylase? (03mark). (b) Give one reason in each case for the results obtained in the tubes kept at (i) 0 0 C (02marks) (ii) 50 0 C (02marks) (c) Suggest the time it would take amylase to digest starch if the temperature is kept at 0 0 C (02marks) 6

7 (d) Describe the test you would carry out to determine the substance into which the starch has been broken. (06marks) Students of S.2 carried out an experiment on soil by placing a weighed mass of sample of sol in a beaker and heated the soil sample while determining the mass of soil at various temperatures. They plotted a graph of variation in mass of the soil sample with increase in temperature and obtained the result below. Mass (mg)

8 Temperature (0 0 C) (a) Explain the observation made between the following temperatures. (i) 0 0 C and C (02marks).. (ii) C and C (02marks).. (iii) C and C (02marks).. (iv) C and C (02marks).. (b) Other than the components of soil involved in the experiment above, name other soil components and state a role played by each. (04marks) (i) Soil component; 8

9 .. Role;.. (ii) Soil component.. Role;.. (c) State an advantage of using the following ways to conserve soil. (03marks) (i) Mulching.. (ii) Crop rotation.. (iii) Irrigation (a) What are vitamins? (02marks).... (b) Study the table below and fill in the gaps. (04marks) 9

10 Food substance lacking in the diet Calcium.. Vitamin B Iron Deficiency disease Night blindness... (c) Outline any two benefits of dietary fibre (roughages) for man. (02marks).... (d) State the function of pancreatic juice during digestion in man. (02marks).... SECTION C (15MARKS) 29. (a) Define digestion (02marks) (b) Describe the digestion of starch in man. (13marks) 30. (a) (i) Differentiate between pollination and fertilization. (02marks) (ii) Describe the processes that occur in a flower from pollination to seed formation (08marks) (b) State five differences between the flowers that are pollinated by wind and those pollinated by insects. (05marks) END GOOD LUCK 10

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