Explain the events in the embryo sac during the process of fertilisation?
Fertilisation. The fusion of male and female gametes is called fertilisation. The process was first discovered by Strasburger (1884). Pollen tube enters through the micropyle and releases male gametes. This is called Porogamy. If pollen tube enters through chalaza, it is called chalazogamy and if pollen tube enters through integuments, it is called misogamy. One male gamete (1n) fuses with egg or oosphere to form oospore (2n) and second male gamete fuses with secondary nucleus (2n) to form the primary endosperm nucleus (3n). In angiosperms where both male gametes are functional and bring about fertilisation of oosphere and secondary nucleus to form oospore and primary endosperm nucleus, is called double fertilisation.
