The cell of the sporogenous tissue undergo meiotic division to form microspore tetrads what would be the ploidy of the cells of sporogenous tissue

Mention about the viability of pollen grain.

In an young anther the four rows of cells which later produce pollen are called

$A$ : Each cell of the sporogenous tissue is capable of giving rise to a microspore tetrads.
$R$ : Most abundant microspore tetrads is the product of simultaneous cytokinesis.

The pollen grain is