Explain all the events that occur for the development of seed from flower.

Explanation

Sexual reproduction in flowering plants : Pollen grains are produced in anther of a stamen while female gamete (egg cell) is produced in each ovule of an ovary.
Pollination : A process of transfer of pollen from anther of stamen to the stigma of pistil is called pollination.

Fertilisation : Pollens stick to stigma. Pollen grain germinates to give rise to pollen tube which develops in style and reaches upto ovule.

The male germ cell produced by pollen grain fuses with female gamete (egg cell) present in the ovule. This fusion of the germ cells is called fertilisation.
Zygote is formed due to the process of fertilisation.
Zygote is capable of growing into a new plant.
Post fertilisation events : After fertilisation, zygote divides several times to form an embryo within the ovule. The ovule develops a tough coat and is gradually converted into a seed.
The ovary grows rapidly and ripens to form a fruit.
The seed contains the future plant or embryo which develops into a seedling under favourable condition. This process is called seed germination.