What is the meaning of 'taxon' in the classification of animals?

Select the correct option on the basis of the following sentences:
$I.$ Biological names are generally in French.
$II.$ The first word in a biological name represents the genus.
$III.$ The second word in a biological name is written in a capital letter.
$IV.$ When the scientific name is handwritten,it should be underlined.

In the scientific name of $Mangifera$ $indica$ $L$.

In a hierarchical system of plant classification,which one of the following taxonomic ranks generally ends in '$ceae$'?

What is the family of $Homo$ $sapiens$?

Which of the following taxonomic categories is less general in characters as compared to genus?