The scientific naming of animals is based on the principles and criteria provided by which organization?

What is the basic unit of classification?

Assertion $A$: Linnaeus is known as the father of taxonomy.
Reason $R$: Linnaeus classified plants into $24$ groups based on floral characteristics.
Which option is correct for Assertion $A$ and Reason $R$?

Four statements are given below regarding the nomenclature of organisms. Which two statements are correct?
$(1)$ The first name denotes the species and the second denotes the genus.
$(2)$ $A$ species name used for one organism cannot be used for another organism.
$(3)$ Each word in a handwritten scientific name must be underlined.
$(4)$ It is mandatory to write the sub-species name after the species name for every organism.

Which of the following is incorrect regarding the rules of nomenclature?

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

$P$

$\uparrow$

Family

$\uparrow$

$Q$

$\uparrow$

Species