The static concept of species was put forward by

Which of the following is a taxon?

Which taxonomic category is formed by a group of closely related species?

Fill in the blanks $A$ and $B$ in the following taxonomic hierarchy:
Kingdom $\rightarrow$ Phylum $\rightarrow$ $[A]$ $\rightarrow$ Order $\rightarrow$ $[B]$

Which of the following represents the correct sequence of decreasing order of diversity?

$Solanum$ and $Homo$ are respectively....