The result of double fertilization in angiosperms is the fertilization of two cells in the ovary of a flower, forming both seed and fruit. One sperm cell fertilizes an egg cell to form an ovule that grows into the seed. The second sperm cell fuses with two haploid polar nuclei at the center of the flower's embryo sac to form the endosperm tissue inside the fruit.
To fertilize the flower, pollen adheres to the female stigma, located at the end of the female reproductive structure of the plant or carpel. The pollen grain grows a pollen tube, penetrating through the micropyle, a small pore in the ovum. The sperm passes through the pollen tube to fertilize the two cells. The first is a diploid zygote that forms the seed. The second cell that forms is a triploid, which divides through mitosis and forms the nutrient-rich tissue in the fruit.
Angiosperms are flowering plants. A large majority of organisms from the plant kingdom fit in this category. Except for in extreme habitats, angiosperms thrive in all land biomes and aquatic communities. Angiosperms are an important food source for both humans and animals due to their production of fruit, leaves, stems, seed and roots.