Question

How is an endosperm formed?

Answer 1

Endosperm is formed when the two sperm nuclei inside a pollen grain reach the interior of a female gametophyte (sometimes called the embryo sac). ... That cell created in the process of double fertilization develops into the endosperm. The endosperm is a tissue produced inside the seeds of most of the flowering plants following fertilization. It is triploid (meaning three chromosome sets per nucleus) in most species

Answer 2

During double fertilization,one male gamete fuses with egg cell (female gamete) to form the zygote (embryo).The other male gametes fuses with two polar nuclei (central cell) to form endosperm cell (food for embryo)