Identify the odd one out from the following.

The correct sequence of taxonomic categories is:

Brassica campestris Linn
$(a)$ Give the common name of the plant.
$(b)$ What do the first two parts of the name denote?
$(c)$ Why are they written in italics?
$(d)$ What is the meaning of Linn written at the end of the name?

When is a rank called a taxonomic category?

Which of the following statements are correct?
$(i)$. Genus comprises a group of related species.
$(ii)$. Taxon represents a taxonomic group of individual organisms.
$(iii)$. Family comprises a group of related genera.
$(iv)$. Taxonomic category class includes related orders.

Plants belonging to different classes,with a few similar characters are assigned to a category called