BOTANY

Detailed explanation-1: -In angiosperms, pollen is produced by the anthers of the stamens in flowers. In gymnosperms, it is formed in the microsporophylls of the microstrobili (male pollen cones). Pollen consists of one or more vegetative cells and a reproductive cell. A pollen grain itself is not the male gamete.

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: -At the two-celled stage, pollen grains are shed from the anther in Angiosperms.

Detailed explanation-4: -Anthers are discrete pollen containing units, found in the stamens of the great majority of angiosperms.

Detailed explanation-5: -The anther produces pollen (male reproductive cells). The filament holds the anther up. During the process of fertilization, pollen lands on the stigma, a tube grows down the style and enters the ovary.