What is the size of $Wolffia$?

Match the following columns based on Bentham and Hooker's classification of Polypetalae:

Column-$I$	Column-$II$
$A$. Thalamiflorae	$i$. Gynoecium always bicarpellary
$B$. Calyciflorae	$ii$. Ovary superior
$C$. Bicarpellatae	$iii$. Receptacle cup-shaped
$D$. Inferae	$iv$. Receptacle dome-shaped
$E$. Heteromerae	$v$. Ovary inferior

Match List-$I$ with List-$II$:

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

Consider the following four statements $(i), (ii), (iii)$ and $(iv)$ and select the right option for two correct statements.
Statements:
$(i)$ In vexillary aestivation,the large posterior petal is called standard,two lateral ones are wings and two small anterior petals are termed keel.
$(ii)$ The floral formula for Liliaceae is $\oplus \text{ } \text{O}\mkern-11mu{^\nearrow} \text{ } P_{(3+3)} A_{3+3} \underline{G}_{(3)}$.
$(iii)$ In pea flower,the stamens are monadelphous.
$(iv)$ The floral formula for Solanaceae is $\oplus \text{ } \text{O}\mkern-11mu{^\nearrow} \text{ } K_{(5)} C_{(5)} A_{5} \underline{G}_{(2)}$.
The correct statements are:

Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Thalamiflorae	$(P)$ Ovary inferior
$(2)$ Inferae	$(Q)$ Always two carpels
$(3)$ Disciflorae	$(R)$ $6$ cohorts and many families
$(4)$ Bicarpellatae	$(S)$ Citrus limon