In the scientific name of an organism,what does the first name represent?

When writing scientific names by hand,what is drawn under each word?

Which of the following is the correct sequence in taxonomic hierarchy?

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

Identify the correct terms for the following analogies:
$(i)$ Cat : Felidae :: Dog : ....
$(ii)$ Scientific name of Mango : Mangifera indica :: Wheat : .....

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.