What develops into a microspore mother cell in a flower?
Trace the development of the cell into a pollen grain, which is ready for germination. Draw a labeled figure of a mature pollen grain. Ans28. The four microsporangia of the anthers have sporogenous cells into them. The sporogenous cells are characterised by their large size, abundant cytoplasm, and prominent nuclei. These sporogenous cells or the microsporocytes undergo several mitotic divisions to increase in number and then function as Microspore Mother Cells (MMC). The MMCs are diploid cells with two sets of chromosomes. Each MMC divides meiotically to give a tetrad of four haploid microspores. The individual microspores get separated, enlarge and undergo a mitotic division to produce a large Vegetative cell (tube cell) and a small Generative cell. This entire structure representing the male gametophyte is called Pollen Grain. Normally pollen grain is shed at this stage. In some plants, the generative cell undergoes mitosis to produce two male gametes before the pollen grains are sh
