How does fertilization occur in flowers? Name the parts of the flower that develop into(i) Seed and (ii) Fruit after fertilization.

Fertilization in flowers typically involves the transfer of pollen from the male reproductive organs to the female reproductive organs. Here's a step-by-step explanation of the process:

Pollination: Pollination is the first step in fertilization. It occurs when pollen grains are transferred from the anther (the male reproductive organ) to the stigma (the female reproductive organ) of a flower. Pollen can be transferred through various mechanisms, including wind, water, insects, birds, or other animals.

Pollen tube formation: Once a pollen grain lands on the stigma, it absorbs moisture and germinates, forming a pollen tube. The pollen tube grows down through the style (a slender tube-like structure) towards the ovary, which contains the ovules.

Double fertilization: The pollen tube reaches the ovary and enters the ovule through a small opening called the micropyle. Within the ovule, there are two important events of double fertilization:

a. The generative cell within the pollen tube divides to form two sperm cells.
b. One sperm cell fuses with the egg cell (located within the ovule) to form a zygote, which will develop into the embryo of the seed.
c. The second sperm cell fuses with two polar nuclei (also within the ovule) to form endosperm, which serves as a source of nourishment for the developing embryo.

After fertilization, certain parts of the flower develop into the seed and fruit:

(i) Seed development: The fertilized ovule develops into a seed. The ovule undergoes changes, including the transformation of the fertilized egg into an embryo. The ovule's outer integument forms the seed coat, which protects the embryo and the endosperm.

(ii) Fruit development: The ovary, which contained the ovules, develops into a fruit. The ovary wall thickens and matures to form the fruit's outer protective layer. The fruit often plays a crucial role in seed dispersal, attracting animals to eat or carry the fruit, thus aiding in the dispersion of seeds.

It's important to note that not all flowers produce fruit. In some cases, after fertilization, the ovary may not develop into a fruit, and the flower may simply produce a seed without an accompanying fruit.