Question

Name the parts marked as ‘A’ and ‘B’ in the given diagram. Write in detail the changes that take place in a flower when the product of ‘B’ reaches ‘A’ till a fruit is formed.

Answer 1

In the provided diagram of the flower, ‘A’ represents the stigma, which is the receptive part of the pistil that captures pollen grains during pollination, while ‘B’ represents the anther, the specific part of the stamen responsible for the production and release of pollen.

Changes in a flower after the pollen reaches the stigma:

1. Pollination: A stigma (A) of a flower receives pollen from the anther (B).
2. Germination of pollen: A pollen tube is formed when the pollen grain germinates on the stigma.
3. Growth of pollen tube: The pollen tube descends to the ovary via the style.
4. Fertilisation: Fertilisation occurs when the male gamete (sperm cell) passes through the pollen tube and fuses with the female gamete (egg) in the ovule in the ovary.
5. Formation of zygote: The fertillised eggs are developed into a zygote.
6. Development of the fruit: The ovule turns into seeds, and the ovary becomes a fruit.