AP BIOLOGY

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.

Detailed explanation-2: -The pollen grains contain sperm which will fertilize the egg and create a seed to sprout the next generation of plants. The name for the whole male part is the stamen. The anther produces the pollen grains that contain the sperm needed for fertilization. The filament supports the anther.

Detailed explanation-3: -Pollen is produced in the microsporangia in the male cone of a conifer or other gymnosperm or in the anthers of an angiosperm flower.

Detailed explanation-4: -Each pollen grain is a single cell containing two male gametes. Once mature, the anther splits open and pollen is released. Both male gametes are involved in fertilisation, resulting in formation of a zygote and an endosperm.

Detailed explanation-5: -There is no sperm present in a pollen grain. A pollen grain is a tiny male plant, a male gametophyte (gamete-forming plant). He is a multicellular organism (usually two cells in flowering plants, but more in the case of gymnosperm pollen) capable of producing sperm if he gets an opportunity.