Who is known as the father of taxonomy?

In the standard taxonomic hierarchy pyramid, what do the parts labeled $P$ (at the top) and $Q$ (at an intermediate level) represent respectively?

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

$A$ group of plants with similar traits of any rank is known as:

According to the rules of biological nomenclature, which name is written in an abbreviated form?

What is considered a species?