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It refers to the classification of living organisms into different groups.

Kingdom is ranked at the highest level of the hierarchy and species is at the lowest rank , which is the basic unit of classification.

  • Organisms are arranged into groups/levels according to their similarities and dissimilarities.
  • As we go up the hierarchy , the organisms have more similarities.

 

Species

Species is a group of individuals consisting of a number of organisms with similar characteristics which are able to breed among themselves to give rise to a fertile offspring .

For Example: Ursus arctos belong to species.

Genus:  

It is a group of species which have less characters in common as compared to species. Members of genus have identical reproductive organs.

For Example: Ursus belong to Genus.

Family: 

A family is the level of classification which consists of a number of Genus with similar characteristics.

For Example: Ursidae belong to family.

Order: 

An order is the level of classification which consists of a number of families with similar characteristics.

For Example: Carnivora belong to order.

Class:

  A class is the level of classification which represents organisms of related orders.

For Example: Mammalia belong to Class.

Phylum/Division:

It includes all organisms belonging to different classes having a few common characteristics.

For Example: All animals belong to the phylum Chordata.

Kingdom: 

A kingdom is the highest level of classification which includes all organisms who share a set of distinguishable common characters.

 

For Example:  Animal Kingdom

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CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Economics, Accounting and English at Teachoo