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QQ1. a) Name the bacteria found in the root nodules of leguminous plant. (1mk)
      b) State the association of the bacteria named in a) above with theÂ
leguminous plants. (1mk)
2. a) State the function of co-factors in cell metabolism.
b) Give one example of metallic co-factor.
3. Name the disease in humans that is cause by lack of vitamin C.  (1mk)
4. Name a disease caused by lack of each of the following in human diet;
Vitamin D (1mk)
Iodine (1mk)
5. Explain how birds of prey are adapted to obtaining their food. (2mks)
6. Explain biological principles behind the preservation of meat by;
i) Salting
ii) Refrigeration
iii) Canning (3mks)
7. State one similarity and one difference between parasitic and predatory modes of feeding (3mks)
8. In an investigation, the pancreatic duct of a mammal was blocked. It was found that the blood sugar regulation remained normal while food digestion was impaired. Explain these observations. (3mks)
9. Give a reason why lack of roughage in diet often leads to constipation.
10. a) What does the term digestion mean? (2mks)
     b) Describe how the mammalian small intestine is adapted to itsÂ
function. (18mks)
                                                                                                                                                                                                                                                                                                    Â
11. State the role of vitamin C in humans. (2mks)
12. a) Distinguish between the terms homodont and heterodont. (1mk)
b) What is the function of carnasial teeth? Â Â Â Â (1mk)
    c) A certain animal has no incisors, no canines, 6 premolars and 6Â
molars in its upper jaw, in the lower jaw there are 6 incisors, 2 canines, 6 premolars and 6 molars. Write its dental formula.
13. a) State two functions of bile juice in the digestion of food.
(2mks)
              b) How does substrate concentration affects the rate of enzyme action? (1mk)
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14. Name the end-products of the light stage in photosynthesis. (2mks)
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HEALTH SCIENCE
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