Final answer:
Male gametophytes in seed plants are commonly known as pollen. They develop from spores on one sporophyte plant and complete their development near the female gametophyte.
Step-by-step explanation:
Male gametophytes in seed plants are commonly known as pollen. The male gametophyte, or pollen grain, is a small organism consisting of 3-6 cells. It develops from a spore on one sporophyte plant and completes its development on another sporophyte plant, near the female gametophyte. The male gametophyte grows to the egg cell of the female gametophyte and fuses with it, donating a sperm nucleus to form a diploid zygote.