Plant families like $Convolvulaceae$ and $Solanaceae$ are included in the order $Polymoniales$ mainly based on their . . . . . . characters.

Classical systematics embodies the concept of classical taxonomists as:

Statement $S$: The naming of an organism is done by two names.
Reason $R$: The first name is the species name and the second name is the genus name.

Which book has most influenced the approach of taxonomists?

Species are considered as

Read the following statements :
$(i)$ Classification is a single step process.
$(ii)$ Classification involves a hierarchy of steps in which each step represents a rank or category.
$(iii)$ Taxon is a unit of ecological hierarchy.
$(iv)$ Mango does not represent any taxon.
$(v)$ Taxonomic categories are distinct biological entities and not merely morphological aggregates.
How many of the above statements are correct?