Q.The first cell of male gametophyte in angiosperm is __________.

The microspore is the first cell of the developing male gametophyte in angiosperms.

Inside the anther, diploid microspore mother cells (pollen mother cells) within the microsporangium undergo meiosis to produce a tetrad of four haploid microspores. Each microspore is the first cell of what will become the male gametophyte: it enlarges, develops a characteristic two-layered wall (exine and intine), and its nucleus divides mitotically (microgametogenesis) to form a vegetative cell and a generative cell, with the generative cell later dividing again to produce two male gametes -- together constituting the mature, three-celled (or, at shedding, often two-celled) pollen grain, the fully formed male gametophyte. This is distinct from the megaspore, the haploid product of meiosis in the ovule that is the first cell of the female gametophyte …