what is meant by exine layer

what is meant by exine layer 630/0' Sexual Reproduction in Fl... microsporangium. It provides nourishment to the developing pollen grains. During microsporogenesis, the cells of tapetum produce various enzymes, hormones, amino acids, and other nutritious material required for the develop . It also produc th€éÄhe-täYéBp f e pollen d the ropo I Have a doubt? ASK OUR EXPERT PAGE

Exine (also called exospore) is the external structural layer of a mature pollen grain. It is a tough resistant outer cuticularized wall composed largely of sporopollenin (a chemically inert biopolymer).

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Outer layer of pollen grain...
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