What does '$X$' represent in the given figure?

What should a student of taxonomy $NOT$ possess?

Identify the following analogy-based questions:
$(i)$ In Yeast and Hydra : Budding :: In Planaria : .....
$(ii)$ Method of naming : Nomenclature :: Organism associated with naming : .....

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

Column $X$	Column $Y$
$(1)$ Death	$(P)$ Measure of disorder
$(2)$ Earthworm	$(Q)$ Proponent of New Systematics
$(3)$ Entropy	$(R)$ Process maintaining life continuity
$(4)$ Huxley	$(S)$ Annelida
$(5)$ Reproduction	$(T)$ Process maintaining population size

What are '$X$' and '$Y$' in the given figure?

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