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Pollen Germination

Name the orga...

Question

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

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Solution

The exine is made up of sporopollenin which is one of the most resistant organic material known. It can withstand high temperatures and strong acids and alkali. No enzyme that degrades the sporopollenin. Pollen grains are well-preserved fossils because of the presence of sporopollenin.

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Q. (a) Name the organic material which makes up 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? [3]

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?

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

Q. Two mark Questions:
Name the organic materials the exine and intine of an angiosperm pollen grains are made up of. Explain the role of exine.

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.

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