Select the appropriate option regarding the anther.

In flowering plants,meiosis occurs at the time of:

$A$: Each cell of the sporogenous tissue is capable of giving rise to a microspore tetrad.
$R$: The most abundant type of microspore tetrad is the product of simultaneous cytokinesis.

Which substance provides protection to pollen grains against high temperatures?

In a pollen grain,the larger nucleus is known as:

An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is