AP BIOLOGY

Detailed explanation-1: -Pollen grains are the male gametes. These are formed in the anther sac, by meiosis cell division each microspore mother cells produces four microspores or pollen grains.

Detailed explanation-2: -Through the process of meiosis, pollen is formed in the pollen sacs (microsporangia) inside the anthers of a flower. The anther, while it is developing from anther primordium (undifferentiated cells), forms two clusters of cells.

Detailed explanation-3: -The anther usually contains four pollen sacs which are responsible for producing pollen grains. Each pollen grain is a single cell containing two male gametes. Once mature, the anther splits open and pollen is released.

Detailed explanation-4: -Stamen: The pollen producing part of a flower, usually with a slender filament supporting the anther. Anther: The part of the stamen where pollen is produced.

Detailed explanation-5: -The anther consists of four saclike structures (microsporangia) that produce pollen for pollination. Small secretory structures, called nectaries, are often found at the base of the stamens; they provide food rewards for insect and bird pollinators.