In which of the following pairs of categories is it more difficult to determine the relationship to other taxa at the same level,thus making the problem of classification more complex?

The International Code of Botanical Nomenclature $(ICBN)$ has provided a code for the classification of plants. Provide the hierarchy of units of classification that botanists follow while classifying plants and mention the different 'suffixes' used for these units.

Which of the following represents the correct scientific name of the mango?

Statement $P$: The nomenclature of an organism is done by two names.
Statement $Q$: The species name is written in small letters.

Which of the following taxonomic categories contains the least number of similarities?

Identify the true statements from below $:-$
$(a)$ Convolvulaceae and Solanaceae belong to the same order
$(b)$ Animals,mammals,and dogs represent different taxa at same levels
$(c)$ Musca domestica is the scientific name of housefly
$(d)$ Taxonomic categories are distinct biological entities