Question

define of embryo sac and structure of embryo sac

Answer 1

EMBRYO SAC:-

 The female GAMETOPHYTE of flowering plants, consisting of a sac-like structure inside the OVULE in which are found six HAPLOID cells (without cell walls) and two haploid nuclei. See Fig. All cells have originated from one haploid nucleus and so are all genetically identical. The name ‘embryo sac’ comes from the fact that the plant embryo develops from within the sac. Two MALE GAMETE NUCLEI enter the embryo sac from the POLLEN TUBE and carry out a ‘double’ fertilization. One male nucleus fuses with the egg cell to give a DIPLOIDzygote (the future plant), the other male nucleus fuses with two polar nuclei giving a triploid fusion nucleus (3n) which develops into the ENDOSPERM (the future food supply in some species).