The process of formation of microspores from a pollen mother cell is called
Megasporogenesis
Microsporogenesis
Megagametogenesis
Microgametogenesis
$A$ : Growth of male gametophyte is completed over the female reproductive organ.
$R$ : $2-$celled stage of partial male gametophyte is developed in-situ.
The tapetal nuclei in anthers of many angiosperm flowers are
Identify $A$ and $B$ in diagram given below:
Location and Function : Endothecium and Tapetum