Question

What is micro sporogenesis and narrate the structure of a mature male gametophyte​

Answer 1

Answer:

Formation of the male gametophyte in flowering plants takes place within specialized male reproductive organs called the stamens. During microsporogenesis, diploid pollen mother cells undergo meiotic division to produce tetrads of haploid microspores. This stage is completed when distinct unicellular microspores are released from the tetrad by the activity of a mixture of enzymes secreted by the tapetum, the inner nutritive layer of the stamen. This results into production of the sperm cell.

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Answer 2

Answer:Microspore or the pollen grain represents the initial cell of male gametophyte. During germination, the cytoplasm of the pollen grain comes out in the form of a tube like structure called pollen tube through the germ pore. The pollen tube carries the tube nucleus cytoplasm and generative cell. The pollen tube grows through the style towards the ovule due to some chemical stimulus inside the ovary. The generative cell of the pollen grain divides by mitosis and forms two haploid non motile gametes. Pollen tube consisting of the two male gametes and a degenerating tube nucleus represents the male gametophyte.