Question

What is the largest group of the classification system? Which is the smallest?

Answer 1

The group of classification is divided into seven categories which are also known as taxonomic categories. In the hierarchical classification, the kingdom lies at the highest position while the species lies at the lowest position.

Complete answer:
In the classification system, the taxonomic hierarchy is the systematic framework in classification in which the taxonomic groups like kingdom, phylum, class, order, family, genus and species are arranged from the higher to lower category. It was given by Linnaeus in 1758 first in the animal kingdom and by Linnaeus, this type of categories is also known as obligate categories. In the case of plants instead of phylum, the division is used and all remain the same. The largest group of classification systems is the kingdom which includes one or more related divisions with less number of common characters between organisms. Kingdoms are mainly - Monera, protists, fungi, Plantae and Animalia.
The species is the smallest group of all classification systems which has a genetically distinct group of organisms and they resemble one another with all essential characters and also they interbreed freely in nature. A single kingdom consists of several different species while a species category consists of a single species, therefore species is also called genetically distinct and reproductively isolated.

Note:
The arrangement of a group of organisms in species to phyla is done based on similarities in characters and their relationship. This similarity was decreased from a lower to a higher category. Taxonomic hierarchy helps in identifying the evolutionary relationship between organisms.