Which of the following methods is $NOT$ a classification system developed by integrating other disciplines?

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 are the levels of organization with conceptual size shown in the figure below?

Match the names of branches of biology listed under column $I$ with the field of study given under column $II$; choose the answer which gives the correct combination of the alphabets of the two columns.
Column $I$ (Branch of biology) | Column $II$ (Field of study)
$A$ Palynology | $p$ Silkworms
$B$ Oncology | $q$ Pollens
$C$ Phycology | $r$ Cancer
$D$ Sericulture | $s$ Algae

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

Why is the study of taxonomy performed?