What is the exine of a pollen grain made of?

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Question

(D) The pollen grain wall is composed of two layers: the outer layer called the exine and the inner layer called the intine.The exine is made of a hig

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Sporopollenin

Vedclass · Answer

(D) The pollen grain wall is composed of two layers: the outer layer called the exine and the inner layer called the intine.The exine is made 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.Therefore,the correct option is $D$.

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In over $60\%$ of angiosperms,pollen grains are shed at the $2$-celled stage. In less than $40\%$ of angiosperms,pollen grains are shed at the $3$-celled stage.

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How many microsporangia does a typical angiosperm anther contain?

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