After penetrating stigmatic and styler tissues, the pollen tube usually grow down towards the egg because
$A$ : Growth of male gametophyte is completed over the female reproductive organ. $R$ : $2-$celled stage of partial male gametophyte is developed in-situ.
In an young anther the four rows of cells which later produce pollen are called
Assertion : Pollen mother cells $(PMCs)$ are the first male gametophytic cells. Reason : Each $PMC$ gives rise to two pollens.
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