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Where is sporopollenin present in plants...

Where is sporopollenin present in plants? State its significance with reference to its chemical nature.

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Sporopollenin is a chemical substance which forms the hard outer layer, exine, of the pollen grains. It is one of the most resistant organic material. It can withstand high temperatures, strong acids and alkali. No enzyme can degrade sporopollenin. Pollen grains are preserved as fossils because of sporopollenin.
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