Q11 of 29 Page 1

Bear hibernates whereas some species of zooplanktons enter diapause to avoid stressful external conditions. How are these two ways different from each other?

Hibernation is a resting stage of some organisms to escape winters by hiding themselves in their shelter. It occurs only in winter. These organisms go in a state of inactivity by slowing down their metabolic functions. eg. bear, rodents and bat.


Diapause is a dormant stage in the development of an organism. It is a stage of suspended development of organisms to cope up their adverse conditions. It occurs both in summer and winter. eg. zooplanktons and insects.


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The figure below shows the relative contribution of four green house gases to global warming:


(i) Identify the gases A and C.


(ii) Why are these four gases called the green house gases?


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At the time of Independence, the population of India was 350 million, which exploded to over 1 billion by May 2000. List any two reasons for this rise in population any two steps taken by the Government to check this population explosion.