Which of the following is a taxonomic category?

What is a $Holotype$?

The branch of Botany concerned with the classification,nomenclature,and identification of plants is:

........... is the genus of man.

In the scientific name $Homo$ $sapiens$ $sapiens$,what does '$c$' indicate?
$\frac{Homo}{a}$ $\frac{sapiens}{b}$ $\frac{sapiens}{c}$

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?