In which family is a monothecous anther found?

$A$: Each cell of the sporogenous tissue is capable of giving rise to a microspore tetrad.
$R$: The most abundant type of microspore tetrad is the product of simultaneous cytokinesis.

The function of the innermost layer of the pollen sac,the tapetum,is:

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

Tapetal cells are characterized by

At which stage of pollen grain development are the male gametes formed?