In angiosperms,all $4$ microspores of a tetrad are covered by a layer which is formed by:

$A$ - 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.

In pollen mother cells,cytokinesis during meiosis is:

In $Capsella$,the microsporangium possesses a nutritive layer called .......

Which part of the reproductive structure produces both enzymes and hormones?

The tapetum is........