Exine of pollen grains is composed of

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

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Sporopollenin

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(C) The outer layer of the pollen grain is called the exine.It is composed of a highly resistant organic material known as sporopollenin.Sporopollenin is one of the most resistant organic materials known; it can withstand high temperatures,strong acids,and alkali,and no enzyme that degrades sporopollenin is known so far.It is derived from carotenoids through oxidative polymerization.

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