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A botanist treated some pollen grains wi...

A botanist treated some pollen grains with enzymes, chemical and high temperature to break exine. After that he observed under the microscope and found that exine is still intact. Why exine is not broken down?

A

Because exine is cellulosic in nature

B

Because pollen grains are small

C

Because exine is coated with sporopollenin

D

None of the above

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The correct Answer is:
C
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Assertion : Exine of a pollen grain is made up of sporopollenin which is resistant to high temperature, strong acid or alkali as well as enzymatic degradation. Reason : Sporopollenin is absent in the region of germ pores.

(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 ?

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