Double fertilization involves two sperm cells; one fertilizes the egg cell to form the zygote, while the other fuses with the two polar nuclei that form the endosperm.Fertilization (also known as conception, fecundation, syngamy and impregnation is the fusion of gametes to initiate the development of a new individual organism.

IMPLANTATION refers to the attachment of embryo to the uterus. DOUBLE FERTILIZATION is a complex fertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes (sperm).
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