The embryo sac or female gametophyte in angiosperms is a 7 celled 8 nucleated structure. It has an egg apparatus towards the micropylar end It has a central haploid cell which is ovum or female gamete. On either sides of the eeg or ovum there is one synergid each. They have filiform apparatus which secretes a fluid which guides the pollen tube into the embryo sac. Synergids degenerate after fertilization.