Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

Each cell of the sporogenous tissue is a potential Pollen Mother Cell (PMC) or microspore mother cell and can give rise to microspore tetrad. This process of formation of microspore from a pollen mother cell through the process of meiosis is called microsporogenesis.
As the anthers mature and dehydrate, the microspores dissociate from one another and form tetrad and develop into pollen grnins. Inside each microsporangium. Several thousands of microspores or pollen grains are formed that are released with the dehiscence of anther.
In general, dehiscence of anther occurs through the rupture of anther lobe walls which causes release of several thousands of pollen grains at a time.