Question

What takes place during double fertilization in angiosperms?

Answer 1

i.On reaching synergid,pollen tube releases the two male gametes into cytoplasm of synergid.

Endosperem (3n) مدام Antipodals polare 00 nuclei zygote (21) Egg Release of Synergids Sperem celi Double feretilisation

ii.One of the male gamete fuses with egg nucleus to form a diploid cell called zygote.This event is called syngamy.

ii.Other male gamete fuses with polar nuclei at the centre to produce a triploid primary endosperm nucleus (PEN).This is termed as triple fusion.

iii.As syngamy and triple fusion take place simultaneously in the embryo sac,it is termed as double fertilisation.

iv.The central cell after triple fusion forms primary endosperm cell(PEC) which later develops into endosperm.

v.The zygote later develops into an ambryo.

vi.endosperm developed from PEN,embryo developed from zygote,seeds developed from ovule,fruit developed from ovary.