(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.

(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.

Class 12 Biology Sexual Reproduction in Flowering Plants Stamen, Microsporangium and Pollen Grain

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Which of the following statements is correct?

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A
Sporopollenin can withstand high temperatures but not strong acids.
B
Sporopollenin can be degraded by enzymes.
C
Sporopollenin is made up of inorganic materials.
D
Sporopollenin can withstand high temperature as well as strong acids and alkalis.