$A.$ Maize is included in the class Monocotyledonae.
$R.$ This class does not contain any order.

The third name of the trinomial nomenclature is of

Which group of taxonomic categories is based on similar characteristics?

In the given diagram,what do the parts labeled $P$ and $Q$ represent respectively?

Select the correct statements $(i-iv)$ regarding taxonomic categories.
$(i)$ Each step or rank in the hierarchy is called a taxonomic category.
$(ii)$ Species is a group of individual organisms with fundamental similarities capable of breeding among themselves.
$(iii)$ Taxonomic studies of all known organisms have led to the development of common categories like kingdom,phylum or division,class,order,family,genus and species.
$(iv)$ Lower the category,greater is the difficulty of determining the relationship to other taxa at the same level.

Which of the following characters given below displays the description of the lowest taxonomic category of organisms in the plant and animal kingdom?