• Microsporogenesis is the formation of microspores and further forms the pollen grains.
• Anther is the fertile portion of the stamen which is tetrasportangiate type and each anther lobe has two microsporangia (pollen sac)
• The primary sporogenous cells may directly function as the microspore mother cell (MMS) and undergo meiotic division to form microspore tetrads.
• Each cell of sporogenous tissue is capable of giving rise to the microspore tetrad so inside each microsporangium thousands of microspore or pollen grains are formed.
• When pollen grain is mature it contains two cells: that is vegetative which is bigger and a smaller one known as generative cell.
• In most of the angiosperms families about 65% the pollen grain is shed at this 2-celled stage (One vegetative and one generative cell.)
• In rest of the species pollen grains may be released during the 3-celled stage (one vegetative cell and two male gametes.)
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