Double fertilisation.
After entering one of the synergids,the pollen tube release the two male gametes into the cyto plasma of the synergid one of the male gamate move towards the egg cell and fuses with its nucleus thus compliting the syngamy the reasult in the formation of a diploid cell,the zygote.thn other male gamet move toward the two poller nuclia located in the central cell and fuses with the to produce a triploid prymary endosperm nuclie sinse two type of fusion triple and syngamy fusion takes place in embryo sac the phenomenone is calld double fertilisation..!!
