First slide

Pre-fertilisation : Structures and Events

Question

How many of the following statements are correct about exine?
(A) It is the hard outer layer of pollen grain.
(B) It is made up of sporopollenin which is the most resistant organic matter known.
(C) It can withstand high temperature, strong acids and alkali.
(D) Exine cannot be degraded by any known enzyme.

Easy

A

A and B only
B

A, B, C and D only
C

B, C and D only
D

A, C and D only

Solution

Pollen grain has a prominent two-layered wall. The hard outer layer called 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 sporopollenin is so far known.

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