Question

Explain the nuclear type of endosperm with suitable examples.

Answer 1

1. It is the most common type found in 161 angiospermic families.
2. Here, the primary endosperm nucleus repeatedly divides mitotically without wall formation to produce a large number of free nuclei.
3. A big central vacuole appears in the centre of the cell, pushing the nuclei towards the periphery.
4. Later, walls develop between the nuclei, hence multicellular endosperm is formed.
5. But in several cases, cell wall formation remains incomplete.
6. Examples: Wheat, sunflower, and coconut. Coconut has multicellular endosperm in the outer part and free nuclear as well as vacuolated endosperm in the centre