DENDROLOGY AND SOCIETY
FAMILIES OF ANGIOSPERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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cuticle
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sporopollenin
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lignin
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cellulose
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Detailed explanation-1: -An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is sporopollenin.
Detailed explanation-2: -The exine is made up of sporopollenin which is one of the most resistant organic material known. It can withstand high temperatures and strong acids and alkali. No enzyme that degrades the sporopollenin. Pollen grains are well-preserved fossils because of the presence of sporopollenin.
Detailed explanation-3: -Sporopollenin is the major component of exine of spores and pollen. It is extremely resistant to chemicals and enzymes. It is chemically stable and remains unchanged in pollen grains even that are 500 million years old. Hence it is the most resistant biological material known.