After Male gametophyte formation and Female gametophyte formation . pollination:pollen grain goes to stigma surface, tube cell produces pollen tube to deliver the sperm to the female gametophyte(embryo sac). Then double fertilization occurs, which is when 1 sperm fertilizes egg forming a zygote, the 1 sperm will combine with 2 nuclei (making 3n endosperm), after double Fertilization, zygote develops into embryo, embryo is turned into a seed which packed with food
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