The generative cell of a 2-celled pollen divides in the pollen tube but not in a 3-celled pollen. Give reasons.

In a 3-celled pollen, the generative cell has already divided and formed 2 male gametes. Hence, it will not divide again in the pollen tube. Since in a 2-celled pollen, the generative cell has not divided, it divides in the
pollen tube.