Cells present in the mature pollen grains are ____________.

Vegetative cell and generative cell

The correct answer is Option (3) – Vegetative cell and generative cell

The pollen grains represent the male gametophytes. When the pollen grain is mature it contains two cells, the vegetative cell and generative cell. In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage. In the remaining species, the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage).