Write about microsporogenesis leading to formation of microspores.

Explanation

Microsporogenesis : Sporogenous cells fill the whole interior of a microsporangium. They divide with the growth of anther and increase their number. Ultimately, they are transformed into microspore mother cells which are diploid (possess two genomes or double set of chromosomes). The microspore mother cells or microsporocytes develop an internal layer of callose which breaks the plasmodesmal connections among themselves. The separated mother cells round off and undergo meiosis to produce tetrads of haploid microspores or pollen grains. The phenomenon is called microsporogenesis. The pollen grains of a tetrad grow and separate from one another. However, they remain attached forming compound pollen grains in Typha. In Calotropis and related plants all the pollen grains of an anther lobe remain united in a single sac called pollinium. Two pollinia of adjacent anthers are attached to produce a translator.