NEET 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: -Pollen sacs are cavities in the male reproductive system, anther, which produce pollen grains. The pollen sacs contain microspore mother cells which divide to produce four haploid microspores. The microspores further form the pollen grain.

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.