Explain the role of tapetum in the formation of pollen-grain wall.


The innermost wall layer of microsporangium is called tapetum. Cells of tapetum have dense cytoplasm and generally have more than one nucleus.


Functions of tapetum –


• It provides nourishment to the developing pollen grains.


• Helps in the formation of exine (the hard outer layer of pollen grain) which is composed of sporopollenin.


• It secretes hormones and enzymes


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