Question

Question 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.

Class 12 - Biology - Sexual Reproduction in Flowering Plants Page 40

Answer 1

Both events (microsporogenesis and megasporogenesis) involve the process of meiosis or reduction division which results in the formation of haploid gametes from the microspore and megaspore mother cells.

Answer 2

Megasporogenesis and Microsporogenesis is diffrentiated below :

Explanation:  

Microsporogenesis:

• Meiotic division (reductional division) in primary mother cells lead to the formation of microspores.
• Microgametogenesis means development of pollen grains
• Pollen grains generally are spherical structure and they posses two wall outer exine and inner intine.
• As anther matures and dehydrates , the microspores dissociate from one another and develop into pollen grains .
• Microgametogenesis comprises events which  lead to the progressive development of unicellular microspore into a mature microgametophyte containing gametes .

megasporogenesis :

• Megasporogenesis is the process when megaspore mother cell undergoes meiosis to produce four haploid cells called mega spores.
• Depending upon the pattern of cell plate and the haploid cell formation it can be monosporic, bisporic or tetrasporic, 70% of angiosperms are monosporic .
• It is well established that the functional megaspore then undergoes further process of development to form gametophyte (embryosac).