What is the scientific name of humans?

Potato and brinjal belong to the genus $Solanum$,which reflects that

The term $Taxon$ for plants was given by .........

In a scientific name,what taxonomic category does the second Latin word indicate?

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

In which of the following systems of classification is each character given equal importance,and at the same time,hundreds of characters can be considered?