Question

when pollen grain is shed at 3 celled stage name the cells it contains

Answer 1

it is called vegetative cell

Answer 2

Answer:

When pollen grain is shed at 3 celled stages, it contains the following cells:

• One vegetative cells
• Two generative cell

Explanation:

Pollen grain refers to incompletely developed microspore which develops into the male gametophyte. It separates by inconsistent mitotic division and leads to the formation of two cells. Consequently, each full grown dust grain in angiosperms has a generative cell and a vegetative cell. In ‘about 60%’ of ‘angiosperms’, pollen grains are shed at this ‘2-celled stage’.  

In certain case, in about 40% angiosperms, the ‘generative cell’ may further ‘divide mitotically’ to produce ‘two male gametes’ and dust grains are shed at this 3-celled stage.