Double Fertilization

Double fertilization is the mechanism of fertilization in which  angiosperms, in which two sperm cells unite with two cells in the embryo sac to form the zygote and endosperm.  It endures that the endosperm will develop only in ovules where the egg has been fertilized.  Therefore prevents angiosperms from useless nutrients.  It gives a rise to the zygotes and endosperms.  When the sperm fertilizes the egg it forms the 2N zygote.  After developing into an embryo sporophyte, it becomes dormant.  When the second sperm joins with 2 polar nuclei it forms a 3N nucleus that divides to become an endosperm.