Isobilateral tetrads are commonly found in........

Anther is generally composed of

Palynology deals with the study of

$P -$ 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.
$\quad\quad \quad P \quad \quad Q$

In $Capsella$,meiosis takes place during

$A$ schematic illustration of the pollen grain is called