Describe the post-fertilisation changes in a flower.

(N/A) Fertilisation is the process of the fusion of male and female gametes to form a diploid zygote. After fertilisation,the following changes occur in a flower:
$1$. The zygote is formed inside the ovule and develops into the embryo.
$2$. The ovules develop into the seeds.
$3$. The ovary develops into the fruit.
$4$. The ovary wall is transformed into a protective layer called the pericarp.