Explanation

Female gametophyte is 7-celled and 8-nucleus structure due to joining of two polar cells. Six out of the eight nuclei are surrounded by cell walls and organized into cells (egg cells and antipodal cells) and remaining two nuclei called polar nuclei are situated below the egg apparatus in large central cell. Thus, a typical angiospermic embryo sac at maturity is 8-nucleate and 7-celled. Mature embryo sac [image:2_image46.png]