Endosperm is formed as a result of:

Explanation

[A] Pollination is the transfer of pollen grains from male anther of a flower to the female stigma[B] Pollen is transferred from any flower of the same plant.[C] Double fertilisation 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.[D] Cross Pollination, transfer of pollen comes from a flower on a different plant