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What is sporopollenin?...

What is sporopollenin?

Text Solution

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(i) It is a substance present is exine of pollen grain and contributed by both pollen cytoplasm and tapetum. It is derived from carotenoids.
(ii) It helps to withstand temperature and is resistant to strong acid, alkali and enzyme action.
(iii) It preserves the pollen for long periods in fossil deposits, and it also protects pollen during its journey from anther to stigma.
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Assertion : Sporopollenin preserves pollen in fossil deposits. Reason : Sporopollenin is resistant to physical and biological decomposition

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.

Read the given statements. (i) Outer exine is made up of sporopollenin. (ii) Inner intine is pecto-cellulosic in nature (iii) Generative cell is bigger and contains abundant food reserve (iv) Vegetative cell is small and floats in the cytoplasm of the generative cell. Which of the given statements are not true regarding structure of pollen grain?