The descending arrangement of taxonomic categories is called:

Assertion $(A)$: $A$ taxonomic category composed of a group of related genera is called a family.
Reason $(R)$: The family $Blattidae$ includes various species of pigeons and doves.

In taxonomic hierarchy,which of the following groups of taxa will have the highest number of similarities compared to others?

Which of the following represents the order of the 'Horse'?

Choose the correct statement regarding biological nomenclature.

All the orders together constitute which of the following?