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

Explanation

During microsporogenesis, the cell of tapetum provide various enzymes, hormones, amino acids and other nutritive materials ot the dividing microsporocytes. The main functions of tapetum are -(a) Transportation of nutrients into anther locule at the time of meisosis in spore mother cells, (b) Secretion of enzymes and hormones , (c ) Production of Ubisch bodies which are coate with sporopollenin to cause thickening of exine, (d) Secretion of an oily material (pollenkit ) over outerside of mature pollen, and (e ) Secretion of special proteins for pollen to recognise compatibility .