Question

Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.

Answer 1

Sexual reproduction is the mode of reproduction in which the produced male and female gametes are fertilised to form a zygote that later forms a new, younger one. The process that results in the formation of gametes is the type of cell division that occurs during these events.

Complete answer:

Character	Microsporogenesis	Megasporogenesis
Process	Microspore tetrad develops and dehydrates, to separate and form Microspore.	In Megaspore tetrad, 3 degenerate, and one undergoes monosporic development to form Megaspore.
Initial State	Formation occurs from a Pollen Mother Cell (PMC)	Formation occurs from a Megaspore Mother Cell (MMC)
Location	The process occurs in the microsporangium	The process occurs in the ovule (Megasporangium)
Amount	Occurs in several PMCs, leading to the formation of thousands of Pollen grains.	Occurs in a single MMC, leading to the formation of usually, one embryo sac.
Division type	Occurs through the Meiotic Cell Division.	Occurs through the Meiotic Cell Division.
Structure formed at the end	The process through which microspores (male gametophyte) are formed.	The process through which megaspores (female gametophyte) are formed.

-Both events (microsporogenesis and megasporogenesis) include the meiosis or reduction division process that leads to the creation of haploid gametes from the mother cells of the microspore and megaspore.
-Microsporogenesis results in the production of haploid microspores from the mother cell of a diploid microspore. Megasporogenesis occurs, on the other hand, in the creation of haploid megaspores from the mother cell of a diploid megaspore.

Note: -MMC and PMC are diploid (2n), while female gametophyte and the male gametophyte are haploid (n), clearly indicating that they are meiotically separated.
-Male gametophytes are pollen grains or microspores.
-The female gametophyte is the embryo sac.
-Sporopollenin, the most resistant organic material known, forms the hard outer layer of the pollen grain, called exine.