Which of the following taxonomical ranks contains organisms that are least similar to one another?

Sapindales is a

Select the correct statements $(i-iv)$ regarding taxonomic categories.
$(i)$ Each step or rank in hierarchy is called taxonomic category.
$(ii)$ Species is a group of individual organisms with fundamental similarities capable of breeding among themselves.
$(iii)$ Taxonomic studies of all unknown 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 is incorrect regarding the rules of nomenclature?

Match the following columns:

Column-$I$ (Common Name)	Column-$II$ (Genus)
$P$. Man	$I$. Triticum
$Q$. Housefly	$II$. Homo
$R$. Mango	$III$. Mangifera
$S$. Wheat	$IV$. Musca

Who wrote the book titled "Théorie élémentaire de la botanique"?