question_answer 2)

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:

(i) Differences between microsporogenesis and megasporogenesis  

Character	Microsporogenesis	Megasporogenesis
1. Definition	This is the formation of microspores in sporogenous tissue (microspore mother cell) due to meiosis.	This is the formation of megaspores in megaspore mother cell due to meiosis.
2. Number of spore mother cells involved	Many.	One.
3. Fate of spore	Microspore leads to development of male gametophyte.	Leads to formation of female gametophyte (embryo sac).
4. Site of occurrence	Pollen sacs (microsporangia) in anther lobes.	In nucellus of ovule.

(ii) Type of cell division during microsporogenesis and megasporogenesis meiosis. (iii) Structure formed — (a) Due to microsporogenesis. Microspores (pollen grains) are formed which lead to development of male gametophyte. (b) Due to megasporogenesis. Megaspores are formed. Out of them one megaspore leads to development of female gametophyte (embryo sac).