Role of meiosis followed by mitotic divisions creates the several celled embryo sac enclosed by integumentary layers with a micropyle and a nutritive layer. Double fertilization produces a zygote and endosperm, a nutritive tissue. Role of the other cells in the embryo sac reflective of an evolutionary past where the many haploid cells formed a plant that lived separately and later formed gamete-bearing structures. Embryo develops to include an embryonic root, embryonic shoot, and attached cotyledons. Endosperm may all be converted to cotyledons.
Integuments harden at the end of embryonic development to form the seed coat.
Discuss peas and beans, and acorns. Vegetables are usually cooked vs. fruits usually eaten raw, vegetables can be any part of the plant whereas fruits are always fruits in the botanical sense, and vegetables are usually seasoned with salt vs. sugar for fruits.