The exine of pollen grain is made up of

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(C) The pollen grain wall is composed of two layers: the inner intine and the outer exine.The exine is the hard outer layer of the pollen grain.It is

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sporopollenin

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(C) The pollen grain wall is composed of two layers: the inner intine and the outer exine.The exine is the hard outer layer of the pollen grain.It is composed of $sporopollenin$,which is one of the most resistant organic materials known.$Sporopollenin$ can withstand high temperatures,strong acids,and alkali,and no enzyme that degrades $sporopollenin$ is known so far.Therefore,the correct option is $C$.

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