Where is the food stored in a pollen grain?

Which of the following is resistant to enzyme action?

The microspore is the first cell of the.......

Given below are two statements: One is labelled as Assertion $(A)$ and the other is labelled as Reason $(R).$
Assertion $(A) :$ Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus.
Reason $(R):$ Presence of more than one nucleus in the tapetum increases the efficiency of nourishing the developing microspore mother cells.
In light of the above statements,choose the most appropriate answer from the options given below:

Identify $A$ to $D$ in the following diagram.

Which of the following statements about pollen grains is incorrect?