Which of the following statements is incorrect?

Development and formation of pollen grains in the anther of the stamen is known as:

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 the structures marked $A$ to $F$ in the given diagram.

Which of the following statements is correct?

In angiosperms,a male gametophyte is developed from a pollen mother cell by . . . . . . .