Q10 of 51 Page 1

Explain the relationship between CFC’s and Ozone in the stratosphere.

The chlorofluorocarbons (CFCs) are non-biodegradable chemicals which are used as a coolant in refrigerators and in air conditioners. In the stratosphere ultraviolet (UV) rays act on CFC's to release chlorine (Cl) atom from the CFC’s. Cl atoms react with ozone to release O2 resulting in ozone layer depletion.


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Suggest four important steps to produce a disease resistant plant through conventional plant breeding technology.

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Name a genus of baculovirus. Why are they considered biocontrol agents?

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Why are sacred groves highly protected?

 11

A. Name the organic material exine of the pollen grain is made up of. How is this material advantageous to pollen grain?

B. Still, it is observed that it does not form a continuous layer around the pollen grain. Give reason.


C. How are ‘pollen banks’ useful?