What happens to a pollen grain first after it is transferred on a stigma?

Correct option is B

The correct answer is (B)   ​It grows a tube to transfer the nucleus to the ovule.

• The pollen grain grows a tube, called a pollen tube, which extends down through the style and reaches the ovary.
• The nucleus of the pollen grain travels through this tube to the ovule. It joins with the nucleus of the ovule, completing the process of fertilization.
• After fertilization, the ovule develops into a seed, ready to grow into a new plant under suitable conditions.

Information booster:

1. Chemical Communication: When pollen lands on the stigma, it communicates chemically with the pistil to ensure it is the correct type of pollen.

2. Germination: The pollen grain absorbs moisture from the pistil and begins to germinate.

3. Pollen Tube Formation: The pollen grain grows a tube, called the pollen tube, which travels down through the style to the ovary.

4. Fertilization: The nucleus of the pollen grain travels through the pollen tube, carrying a male gamete. This male gamete meets the female gamete in the ovule. The two gametes fuse, combining their chromosomes to form a fertilized cell.

5. Seed and Fruit Development: The fertilized ovule develops into a seed, which contains an embryo and stored nutrients. The ovary transforms into a fruit, which protects the seed and aids in its dispersal.