The vegetation of Delhi is chiefly

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

Column $X$	Column $Y$
$(1)$ Hibiscus	$(P)$ Bougainvillea spectabilis
$(2)$ Catharanthus roseus	$(Q)$ Lemon
$(3)$ Bougainvillea	$(R)$ Hibiscus rosa-sinensis
$(4)$ Citrus limon	$(S)$ Periwinkle

Find the incorrect match:

Statement $X$: $Hibiscus$ $rosa-sinensis$ was placed in $Thalamiflorae$ by $Bentham$ and $Hooker$.
Statement $Y$: It possesses a cup-shaped thalamus and its petals are fused.

The following diagrams represent the type of placentation in an ovary. Identify the correct combination of labelling for $1 - 2 - 3$.

Justify the following statements on the basis of external features:
$(i)$ Underground parts of a plant are not always roots.
$(ii)$ Flower is a modified shoot.