Describe the post-fertilization changes in a flower.

After the process of fertilization, the embryo undergoes a number of mitotic divisions to form a multicellular embryo. The endosperm nucleus also goes through a series of divisions to form a mass of endosperm cells. These endosperm cells provide nutrition to the developing embryo.

After fertilization, the following changes are observed in a flower:
. There is the formation of a diploid zygote and it develops into an embryo, which forms the future plant.
. The endosperm cells serve as a source of nutrition for the developing embryo.
. The ovule becomes the seed.
. The ovary becomes the fruit.
. In most plants, the antipodals and synergies disintegrate before, during, or immediately after fertilization.
. The outer and inner integuments of the ovule become the testa or the seed coat of the seed.
. Petals and sepals fall off.