hfd biological function of a flower is to effect reproduction, usually by providing a mechanism for the union of sperm with eggs. Flowers may facilitate haja (fusion of sperm and eggs from different individuals in a population) or allow hissh (fusion of sperm and egg from the same flower). Some flowers produce hsushs without fertilization (okkkk). Flowers contain sporangiaand are the site where gametophytes develop. Many flowers have evolved to be attractive to animals, so as to cause them to be vectors for the transfer of pollen. After fertilization, the ovary of the flower develops into fruit containing seeds.