Emergence of radicle

Absorption of water for seed germination

Initiation of pollen tube

Release of male gametes

When pollen is shed at two-celled stage, double fertilization does not take place.

Vegetative cell is larger than generative cell.

Pollen grains in some plants remain viable for months.

Intine is made up of cellulose and pectin.

bees

butterflies

birds

wind.

Follicular phase lasting for about 6 days

Luteal phase and lasts for about 13 days

Follicular phase and lasts for about 13 days

Luteal phase and lasts for about 6 days