An anther of a typical Datura flower produces 256 microspores in each of its microsporangium. What is the total number of microspores produced by that flower and how many microspore mother cells are required to form these microspores?

Anther is dithecous in Datura. There are five stamens in Datura flower. Hence, the number of microspores formed are 256 x 4 (sporangia) x5 (Stamens) = 5120
Number of pollen mother cells = 256/4 = 64 (pollen mother cells). 64 x 4 (sporangia) x5 (Stamens) = 1280.