Anthers are the male parental tissue in which pollen grains are formed. Ovaries are the female parental tissue in which ovules are formed. 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.