In flowering plants,meiosis occurs at the time of:

How many meiotic divisions will be necessary to produce $200$ pollen grains?

In a young anther,the four rows of cells which later produce pollen are called:

$P -$ This cell is big,has abundant food reserve and a large irregularly shaped nucleus.
$Q -$ This cell is small and floats in the cytoplasm of the vegetative cell. It is a spindle-shaped cell with dense cytoplasm and a nucleus.
$\quad\quad \quad P \quad \quad Q$

What is the ploidy of male gametes in flowering plants?

The androecium is a whorl of ..........