First slide

Pre-fertilisation : Structures and Events

Question

Outer layer of pollen grains is made up of

Easy

A

Sporopollenin
B

Pectin and cellulose
C

Lipids and carotenoids
D

Chitin

Solution

The hard outer layer of pollen grains 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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