AP BIOLOGY

Detailed explanation-1: -The highly reduced male gametophyte of angiosperm plants is a two-or three-celled pollen grain. Its task is the production of two male gametes and their transport to the female gametophyte, the embryo sac, where double fertilization takes place.

Detailed explanation-2: -So, the pollen is an immature or partially developed male gametophyte. Similarly, the unicellular microspore produces male gametes and develops into mature microgametophyte by the process of mitotic cell division. Hence, the pollen grains are immature male gametophyte and partially developed male gametophyte.

Detailed explanation-3: -The female gametophyte is also commonly called the embryo sac or megagametophyte. The male gametophyte, also called the pollen grain or microgametophyte, develops within the anther and consists of two sperm cells encased within a vegetative cell (Gifford and Foster, 1989).

Detailed explanation-4: -Male gametes are found inside tiny pollen grains on the anthers of flowers. Female gametes are found in the ovules of a flower. Pollination is the process that brings these male and female gametes together.