Plants growing on sandstone are known as:

Which of the following statements regarding nomenclature is correct?

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

Which of the following statements are not correct?
$(i)$ The number of characteristics in common increases down the hierarchy.
$(ii)$ Order is the assemblage of genera which exhibit a few similar characters.
$(iii)$ Cat and dog are included in the same family Felidae.
$(iv)$ Binomial nomenclature was introduced by Carolus Linnaeus.

What is the essential requirement for a student of taxonomy?

Match Column $X$ with Column $Y$ and select the correct option:

Column $X$	Column $Y$
$(1)$ Population	$(P)$ Group of closely related species
$(2)$ Differentiation	$(Q)$ Result of metabolism
$(3)$ Family	$(R)$ Energy available for any system's work
$(4)$ Growth	$(S)$ Formed by individual organisms
$(5)$ Potential energy	$(T)$ Change in embryonic cells according to their specific functions