 After the pollen tube grows through the carpel's style, the sperm from the pollen grain migrates into the ovule to fertilize the egg cell and central cell within the female gametophyte in a process termed double fertilization.The resulting zygote develops into an embryo, while the triploid endosperm (one sperm cell plus a binucleate female cell) and female tissues of the ovule give rise to the surrounding tissues in the developing seed.The ovary, which produced the female gametophyte(s), then grows into a fruit, which surrounds the seed(s).