In pea plants,the ovule is . . . . . . .

Given below are two statements: One is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A):$ $A$ typical unfertilised,angiosperm embryo sac at maturity is $8$-nucleate and $7$-celled.
Reason $(R):$ The egg apparatus has $2$ polar nuclei.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following structures is not a part of the pistil (gynoecium)?

In a typical angiosperm,how many female gametophytes develop within a single megasporangium?

The ovule is attached to the placenta by . . . . . . .

Define/Explain the following terms:
$1.$ Micropyle
$2.$ Chalaza