What do $P$ and $Q$ represent in the given figure?

$A$ student was given a description of a flower: bisexual, actinomorphic, pentamerous, gamosepalous, gamopetalous, with $5$ stamens in epipetalous condition, and a bicarpellary, syncarpous, superior ovary. Which of the following is the correct floral formula for this flower?

Identify $X$ in the given figure.

Definitions / Explanation :
$(i)$ Phylloclade
$(ii)$ Aestivation

Which of the following plants exhibit variation in the length of their filaments within the same flower?

Given below are two statements.
Statement-$I$: The arrangement of ovules within the ovary is known as placentation.
Statement-$II$: If a fruit is formed by fertilization of the ovary,it is called a parthenocarpic fruit.
Choose the correct answer from the options given below.