Choose the correct option regarding the anther.

How many pollen mother cells are involved in the formation of $8$ pollen tetrads?

$A$ - Only some cells of the sporogenous tissue are capable of giving rise to microspore tetrad.
$R$ - The microspores are arranged in a cluster of four cells - the microspore tetrad.

The pollen grain represents

The number of pollen sacs in a dithecous anther is

List the products derived from pollen grains and explain their uses.