Question

in flowering plants the changes which we observe before and after fertilisation

Answer 1

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