The function of endothecium is

Microsporogenesis is

Complete the following flow chart

Pollen Mother cell $\to $ Pollen tetrad $\to $ Pollen grain $\to $ Vegetative cell

Pollen Mother cell $\to $ Pollen tetrad $\to $ Pollen grain $\to $   ……….

Pollen tablets are available in the market for

Assertion : If pollen mother cells has $42$ chromosomes, the pollen has only $21$ chromosomes.
Reason : Pollens are formed after meiosis in pollen mother cell.