Which one of the following animals is correctly matched with its particular named taxonomic category?

Which of the following is incorrect $w.r.t.$ Species?

Which scientific term is used for a convenient category for the study of organisms?

In an organism's scientific name,the second word indicates........

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?

What is the taxonomic rank of $Rhizobium$?