Microscopic pollen grains of the past are obtained as fossils. Mention the characteristics of the pollen grains that make it happen.


•    The outer layer of pollen grain is made up of hard layer called exine. The exine is made of sporopollenin.
•    Pollen grains are preserved as fossils because of the presence of sporopollenin.
•    Sporopollenin is one of the most resistant organic substance known.
•    It can withstand high temperatures and strong acids and alkalis.
•    Sporopollenin is not degraded by any enzyme.

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