Microsporogenesis MCQ - Practice Questions with Answers

Microsporogenesis:

• The formation of microspores or pollen grains inside the microsporangium is known as microsporogenesis. 
• When the anther is young, a layer of homogenous cells occupies the centre of each microsporangium, is known as sporogenous tissue. 
• It is diploid in nature. 
• The sporogenous tissue transforms into microspore or pollen mother cells.
• These microspore mother cells undergo meiotic divisions to form microspore tetrads (four microspores) which are haploid. 
• These microspores mature to form pollen grains, male gametes. 
• One microspore mother cell forms four microspores.
• The microspores develop to form the pollen grains.
• In some cases, all the four pollens remain attached to form compound pollen grain, as seen in Typha.
• In Calotropis, all the pollen grains of an anther lobe remain united in a single sac called pollinium.
• Each microsporangium contains thousands of microspores or pollen grains.

Dehiscence of Anther:

• Upon maturity, the anther dries up.
• The sterile strip present between the two pollen sacs of each anther lobe disintegrates and a single cavity is formed in each anther lobe called theca.
• Hence, there are two thecae in a mature anther, hence, dithecous.
• Dehiscence is aided by the cells of endothecium as they lose water, shorten and rupture the wall at the stomium.