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  4. The hard outer layer of pollens, named exine, is made of

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Q. The hard outer layer of pollens, named exine, is made of

KVPYKVPY 2016

Solution:

Sporopollenin is one of the most chemically inert biological polymers. It is a major component of the tough outer (exine) walls of plant spores and pollen grains. It is chemically very stable and is usually well-preserved in soils and sediments.