(a) Eight nuclei in mature Embryo sac
- Three cell form an egg apparatus , consisting of one egg cell and two synergids
- Three cells at chalazal end called antipodals
- A large central cell with two polar nuclei
(b) After entering a synergid, pollen releases two male gametes into the cytoplasm
- one male gamete fuses with egg nucleus and completes syngamy resulting in zygote
- other male gamete fuses with the two polar nuclei located in the central cell to produce a triploid primary endosperm nucleus this is called triple fusion
- since two types of fusions take place ---> double fertilisastion
