LIFE SCIENCE

Detailed explanation-1: -Hence, during the formation of pollen grains, the microspore mother cell undergoes one meiotic division to produce four haploid microspores, generally in the form of a tetrad, which then develops into pollen grains.

Detailed explanation-2: -In angiosperms, all the sporogenous cells in the anther become microspore mother cells which undergo meiosis or reduction division to form a tetrad or a group of four pollen grains.

Detailed explanation-3: -The process of formation of microspores from a mother cell through meiosis is called microsporogenesis. The microspores, as they are formed, are arranged in a cluster of four cells-the microspore tetrad. As the anthers mature and dehydrate, the microspores dissociate from each other and develop into pollen grains.

Detailed explanation-4: -In the process of male gamete formation, a pollen mother cell undergoes meiosis to form a tetrad of microspores enclosed in callose (1, 3- glucan; Figure 12.1). Dissolution of the callose occurs by enzymes released from the tapetal cells, dispersing the individual 1N microspores.