Question

how flower changes into fruit

Answer 1

by the production of flower it changes into fruit

Answer 2

When a grain of pollen reaches the stigma, it creates a pollen tube for the sperm to journey down the style and fertilize the ovule; fertilized ovules become seeds. Fertilization is the death of theflower, as the petals drop or wither at this point and the ovary starts to enlarge and ripen into what we know as fruit