Which cell of the pollen grain is responsible for forming the endosperm during double fertilization in angiosperms?

Step-by-step solution

1. In double fertilization, the first sperm fuses with the egg cell to form the zygote.
2. The second sperm fuses with the central cell nucleus (which contains two polar nuclei).
3. Fusion of the second sperm with the central cell forms a triploid endosperm.
4. Thus the cell that contributes to endosperm formation is the central cell nucleus.
5. The other options – egg cell, pollen tube tip, filament nucleus – do not form endosperm.

Concept tested: Double fertilization

Published 27 September 2026 · How this solution was prepared and checked