An unfertilized embryo sac of angiosperm is composed of 7 cells i.e., 7-celled and 8-nuclei. Among 8-nuclei, 6 are enclosed by cell walls and are organized into cells, which are haploid in number - 3 antipodal, 2 synergids and 1 egg cell and a large central cell with 2 pollen nuclei.