to produce 500 pollen grains,how many microspore mother cells r required???? plz explain....

For the production of 500 pollen grains, 125 microspore mother cells are required.  

 It is because, 4 microspores are produced from meiotic division of  one microspore mother cell during microsporogenesis . Each of the microspore produced, develop into a pollen grain. 

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