First slide

Pre-fertilisation : Structures and Events

Question

Pollen grains can be preserved as fossils because

Easy

A

they vary from species to species
B

they have variety of architecture
C

they are made up of sporopollenin
D

they exhibit a fascinating array of pattern and design

Solution

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. Pollen grains are well preserved as fossils because of the presence of sporopollenin.

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