In monocots, male gametophyte is
Microspore
Megaspore
Tetrad
Nucellus
Identify $A$ to $E$ in the following diagram
$A$ : The generative cell comes to lie freely in the cytoplasm of the tube cell.
$R$ : Cellulosic wall around generative cell is dissolved.
Intine of pollen grains is composed of
Identify $A$ to $D$ in the following diagram
Pollen grains are generally _________ in outline measuring _________ micrometers in diameter.