Q10 of 42 Page 1

What is chance mutation? Explain this phenomenon using application of DDT as an example.

DDT is an insecticide that kills most of the insects, but some become resistant varieties, in much less time scale of just months or years. It is a chance event in nature therefore it is a chance Mutation.


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How do mammals living in colder regions and seals living in polar regions able to reduce the loss of their body heat?

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(a) State what happens in the human body when malarial parasites infected RBCs burst to release the parasites in the blood.

(b) Mention the specific sites in the host body where production of


(i) sporozoites and


(ii) gemetocytes take place in the life cycle of the malarial parasites.


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Explain the changes that can be observed in the characteristics of river water when sewage is discharged into it and a few weeks after the discharge with respect to:

(i) level of dissolved oxygen


(ii) population of fresh water organisms.