DENDROLOGY

Detailed explanation-1: -Microgametophytes are formed within the microsporangia of the microstrobilus, or pollen cone. These structures are all diploid. Within the microsporangium, there are microsporocytes (also called microspore mother cells), diploid cells that undergo meiosis to produce haploid microspores.

Detailed explanation-2: -Both gymnosperms (cone-bearing plants) and angiosperms (flowering plants) produce pollen as part of sexual reproduction. In gymnosperms pollen is produced in microsporangiate cones (male cones or pollen cones), while in angiosperms pollen is produced in the anthers (part of the stamen within the flower).

Detailed explanation-3: -Microsporogenesis in the anther involves the meiotic division of pollen mother cells, which each produce four microspores. These then undergo mitosis to form pollen grains (microgametophytes), which at maturity consist of only three cells, the tube cell and two non-motile sperm cells.