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Male Gametophyte

The exine of ...

Question

The exine of pollen grain is hard and resistant to enzyme action. Give reasons.

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Solution

Exine has outer layer that is made up of sporopollenin. It is the most resistant organic compound and tolerate high temprature, strong acid and alkalis. It cannot be degraded with the help of any enzyme. Therfore, it protects the pollegrain from degradation.

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Q. The exine of pollen grain is hard and resistance to enzyme action. Give reason.

Q. Choose the correct statement(s) regarding pollen grains.
I. Pollen grains are the male gametes of the flowering plant.
II. Pollen grain has a prominent two-layered wall.
III. The outer thick wall of pollen grain is called exine and the inner thin wall is called intine.
IV. The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic materials known.

The most resistant organic material present in the exine of pollen grains is:

Q. (a) Name the organic material of the exine of the pollen grain. 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?

Q. One of the most resistant biological material present in the exine of pollen grain is?

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