Question

Explain the role of tapitum in the formation of wall of pollen grain walls?


class 12th CBSE Biology sample paper

Answer 1

Tapetum is the innermost layer of the 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 development of pollen grains. It also produces the exine layer of the pollen grains, which is composed of the sporopollenin.

Answer 2

Tapetum is the inner most wall layer of microsporangium or pollen chamber of anther.

In angiosperm, the cell of tapetum are of two types :

1)Glandular (or secretory) tapetum and 2) preiplasmodial (or ameboid) tapetum .

The glandular cells of tapetum help in the formation of walls of pollen grains, they secrets some substance .

the tapetal cell from pro-ubisch bodies sporopollenin.

These bodies now called Ubisch bodies which cause thickmimg of exine wall layer of pollen grain.