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(C) The outermost layer of the pollen grain wall is called the exine.It is composed of a highly resistant organic material known as Sporopollenin.Spor

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Sporopollenin

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(C) The outermost layer of the pollen grain wall is called the exine.It is composed of a highly resistant organic material known as Sporopollenin.Sporopollenin is a carotenoid derivative that is resistant to high temperatures,strong acids,and alkali.No enzyme is known that can degrade Sporopollenin,which allows pollen grains to be preserved as fossils for long periods.

The most resistant organic material known which makes up the outermost layer of pollen wall is

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