How many pollen grains will be formed after meiotic division in ten microspore mother cells?

40

The correct answer is option (3) - 40

Meiosis is a process of cell division that reduces the number of chromosomes by half. After meiotic division in ten microspore mother cells, the number of pollen grains formed would be: 40

Each microspore mother cell undergoes meiosis, resulting in the formation of four haploid microspores.

Therefore, if there are ten microspore mother cells, the total number of pollen grains formed would be 4 microspores per cell x 10 cells = 40 microspores.

Each microspore develops into a pollen grain, so the total number of pollen grains formed would be 40.

Therefore, the correct answer is (3) 40.