Question

A pollen grain in an angiosperm at the time of dehiscence from an anther could be to sell or 3 celled explain

Answer 1

Answer

A pollen grain is partly germinated microspore representing the male gametophyte. It divides by unequal mitotic division and forms two cells. Thus, each mature pollen grain in angiosperms have a generative cell and a vegetative cell. In about 60% of angiosperms, pollen grains are shed at this 2-celled stage.

However, in about 40% flowering plants, the generative cell may further divide mitotically to give rise to two male gametes and pollen grains are shed at this 3-celled stage. The placement of cells within the pollen grain when shed at 2-celled stage can be visualised as :

Answer 2

Function of Pollen Grain

Explanation:

• A pollen grain is partly germinated microspore representing to the male gametophyte
• It divides by unequal mitotic division and structures two cells. In this way, each develop pollen grain in angiosperms have a generative cell and a vegetative cell
• In about 60% of angiosperms, pollen grains are shed at this 2-celled stage  
• The generative cell isolates mitotically to offer ascent to the two male gametes before pollen grains are shed at the (three-celled stage(are vegetative cell and two male gametes