Question

How are pollen grain preserved as fossils

Answer 1

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pollen grain are preserved as fossils because the presence of sporopollein

Answer 2

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