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.
A microspore mother cell forms
Identify $A$ to $D$ in the following diagram
Which of the following is a useful method to store the pollen grain
The thin and continuous wall layer of pollen is