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

Explanation

Tapetum is the innermost layer of the microsporangium. It produces the exine layer of the pollen grains made up of sporopollenin, the most resistant fatty substance. During microsporogenesis, the cells of the tapetum produce various enzymes, hormones, amino acids and other nutritious material required for the development of pollen grains.