Question

The male gametophyte (microgametophyte) in the case of monocots is:
A. Tetrad
B. Nucellus
C. Megaspore
D. Microspore

Answer 1

Hint: the male gametophyte are normally rounded, small haploid cells produced due to meiosis in the microspore mother cell within the microsporangia.

Step by step solution:
The microspore mom cells or pollen mom cells present inside the anthers divide meiotically to provide microspore tetrads. Each microspore develops into pollen grains or male gametophytes. Microspores are land plant spores that turn into male gametophytes. Microspores are systems that are a part of the alternation of generations in lots of seedless vascular cryptogams, all gymnosperms, and all angiosperms. Microspores are haploid and are diploid microsporocytes through meiosis.
So, option D is correct.
Additional information
The male gametophyte of angiosperms is a microspore. Microspores are haploid, uninucleate, minute spores produced in large numbers due to meiosis withinside the microspore mother cell withinside the microsporangia. These are the primary cells of gametophytic generations of angiosperms. The microsporangium of a gametophyte bears diploid microsporocytes that go through the meiotic department to provide haploid microspores. In seeded flowers, including gymnosperms and angiosperms, the microspores divide mitotically to supply pollen grains. Microspore refers to the spore produced via means of sporophytes. It is haploid and offers rise to a male gametophyte. The microspore is typically smaller in length as compared to the megaspore. And the microspore develops specifically into a haploid male gametophyte. The megaspore, in comparison, develops into a haploid woman gametophyte.
Note: In monocots, the male gametophyte is shaped withinside the pollen grain. The microspores have 3 layers: the outer perispore, the middle exospore, and the innermost endospore.