Microsporogenesis is the process of the male gamete development in Angiosperms from the microspore mother cell. A tetrad is formed by a meiotic divisional process that leads to the formation of the pollen grain.

The pollen grain is a two-layered structure having outer exine and inner intine. When the pollen grain matures, it contains two cells - vegetative cells and a generative cell. The generative cell further divides and forms the two male gametes which will participate in the double fertilization process. In nearly 60% of the angiosperms, pollen is released in the two-celled stage and the rest, it is released in the three-cell stage.