AP BIOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -Sperm in plants Sperm cells in algal and many plant gametophytes are produced in male gametangia (antheridia) via mitotic division. In flowering plants, sperm nuclei are produced inside pollen.

Detailed explanation-3: -The pollen tubes grow out of the grains, becoming longer and longer, and move through the pistil toward the flower’s ovules. Inside the tubes are the sperm cells that will fertilize the egg cells and cause them to develop into seeds.