In an epigynous flower,what is the orientation of the micropyle?

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:

The megaspore mother cell is differentiated from one of the cells of the

Which of the following is not a part of the pistil?

What do '$a$' and '$b$' represent in the given figure?

The female gametophyte of a typical dicot at the time of fertilization is