Question

The wall layer of microsporangium, which nourishes the pollen grain, is ______.

Options

• epidermis

• endothecium

• middle layers

• tapetum

Answer 1

The wall layer of microsporangium, which nourishes the pollen grain is tapetum.

Explanation:

• The microsporangium, or pollen sac, is the portion of the anther where microspores are formed. The pollen sac wall is composed of four layers: epidermis, endothecium, middle layers, and tapetum.
• The innermost layer, the tapetum, is composed of multinucleated cells with thick cytoplasm and reserve food resources.
• The epidermis, endothecium, and middle layers are the other three wall layers that surround it. It nourishes the growing microspores or pollen grains.