Which of the following statements is correct?

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(D) Pollen grains are generally spherical and possess a prominent two-layered wall.The hard outer layer,called the exine,is made up of sporopollenin,w

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Sporopollenin can withstand high temperature as well as strong acids and alkalis.

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(D) Pollen grains are generally spherical and possess a prominent two-layered wall.The hard outer layer,called the exine,is made up of sporopollenin,which is one of the most resistant organic materials known.It can withstand high temperatures,strong acids,and strong alkalis,and no enzyme is known that degrades sporopollenin.

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