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

The International Code of $Biological$ $Nomenclature$ is applicable to:

Match Column-$I$ (Scientist) with Column-$II$ (Contribution) and select the correct option:

Column-$I$ (Scientist)	Column-$II$ (Contribution)
$(a)$ Carolus Linnaeus	$(i)$ New Systematics
$(b)$ Julian Huxley	$(ii)$ Five Kingdom Classification
$(c)$ Whittaker	$(iii)$ Plant Classification Systems
$(d)$ Bentham and Hooker	$(iv)$ Binomial Nomenclature

Plants growing on sandstone are known as:

Which one of the following organisms is scientifically correctly named,correctly printed according to the International Rules of Nomenclature,and correctly described?

Which of the following pairs is mismatched?