Question

How does fertilization take place in an angiospermic plant? Describe post-fertilization structures and events.

Hint:

Fertilization in angiosperms = Pollen tube growth +Syngamy (zygote) + Triple fusion (endosperm) +Seed and fruit formation.

Answer 1

Fertilization Process in Plants:

1. The pollen grain lands on the stigma and germinates, forming a pollen tube.

2. The pollen tube grows through the style and reaches the ovule in the ovary.

3. The generative cell divides to form two male gametes.

4. One male gamete fuses with the egg cell to form the diploid zygote (syngamy).

5. The other male gamete fuses with the two polar nuclei to form the triploid endosperm (triple fusion).

Post-Fertilization Structures and Events:

- Zygote Formation: The fertilized egg develops into an embryo.

- Endosperm Development: Provides nourishment to the developing embryo.

- Ovule Transformation: The ovule develops into a seed.

- Ovary Transformation: The ovary matures into a fruit.

- Other Floral Parts: Sepals, petals, and stamens usually wither away.