Karyotaxonomy is the modern branch of classification which is based on

In the taxonomic hierarchy,which of the following groups of taxa will have the fewest number of similarities compared to the others?

The correct sequence of taxonomic categories is

The common taxonomic categories are given below. Arrange them in the correct sequence starting from the smallest unit:
$(i)$ Genus $(ii)$ Family $(iii)$ Species $(iv)$ Order $(v)$ Subspecies

$A$ group of organisms that are very similar to each other and can freely interbreed in nature constitutes a .......

In taxonomy,the category 'Class' is placed between which of the following?