Why Pollen Grains Are Well Preserved As Fossils

Pollen grain

The presence of sporopollenin causes them to be well-preserved. Pollen grains have an evident two-layered wall wherein exine is the exterior hard outer layer composed of sporopollenin. This is one of the most resistant organic materials that is known. It can tolerate extreme high temperatures and strong alkali and acids. There is no enzyme known so far which can degrade sporopollenin.

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