"Pedology" is the study of

Why is the study of taxonomy performed?

Based on the levels of organization in biological sciences,what does the part marked '$P$' represent?

Study the four statements $(A-D)$ given below and select the two correct ones out of them.
$A.$ Definition of biological species was given by Ernst Mayr.
$B.$ Photoperiod does not affect reproduction in plants.
$C.$ Binomial nomenclature system was given by $R$.$H$. Whittaker.
$D.$ In unicellular organisms,reproduction is synonymous with growth.
The two correct statements are:

Which one of the following criteria is/are essential and form the basis of modern taxonomic studies?

Match the terms in Column-$I$ with their definitions in Column-$II$:

Column-$I$	Column-$II$
$(a)$ Growth	$(i)$ The number of individuals of each species remains limited.
$(b)$ Development	$(ii)$ New organisms differ from parents and may lead to new species.
$(c)$ Death	$(iii)$ Organisms increase in body size after birth.
$(d)$ Adaptation	$(iv)$ Organisms adjust to the environment by changing their structure,function,or behavior.
$(e)$ Variation	$(v)$ Cells of the zygote undergo changes according to their specific functions.
	$(vi)$ Organization of membranes and organelles by macromolecules.