DENDROLOGY

Detailed explanation-1: -The pollen grain grows into the male gametophyte on germination which is initiated before pollination takes place. Inside the microsporangium, Pollen mother cell (PMC) undergoes meiosis and results in four microspores which eventually mature into pollen grains.

Detailed explanation-2: -Pollen grains are small, round structures that contain the male gametes. They are moved from plant to plant with wind and pollinators. Pollen grains are located on the anther of the flower. The female gametophyte of a seed plant is the ovule.

Detailed explanation-3: -The male gametophyte of seed plants is pollen, an organism of 3-6 cells that initiates its development from a spore on one sporophyte plant and completes its development on another sporophyte plant, in a location near that of the female gametophyte.

Detailed explanation-4: -Development of pollen grains (male gametophytes) takes place in the anther. Pollen development begins when specialized cells (microsporocytes) differentiate in young anthers. There are generally hundreds or thousands of microsporocytes per anther and each passes through meiosis to produce four haploid microspores.