Two Kingdom System of Classification - Taxonomy | Biology Class 11

Notes | Botany
Two Kingdom System of Classification -  Taxonomy
For: Science Class 11

The taxonomy is the branch of biology, which deals with identification, naming, and classification of organisms. The father of taxonomy is considered as Carolus Linnaeus.

Two Kingdom System of Classification 

Carolus Linnaeus divided the organisms into two kingdoms, the plant Kingdom and the Animal Kingdom. This system was based on the characteristics of animals and the plants.

Plant Kingdom	Animal Kingdom
The organisms of this kingdom are autotrophic i.e. they bear chlorophyll molecule  They have cellulosic cell wall around the cell  The body is fixed at one place  They are less sensitive due to absence of nervous system  Their reserved food material is starch  Centrosome is absent in the cell  Large vacuoles are present in the cells  The body is branched having definite shape	The organisms of this kingdom are heterotrophic i.e. they do not bear chlorophyll  They don't have cellulosic cell wall in the cell  They show locomotion, not fixed organisms  They are highly sensitive due to presence of nervous system  Their reserved food material is glycogen  The centrosome is present in the cell  Vacuoles are very small or absent  The body is compact having definite shape

Shortcomings of Two Kingdom System of Classification 

The cell of bacteria consists of cell wall and it is heterotrophic. They show characters of both plants and animals. The body of fungi is highly branched and cell has cell wall but they are heterotrophic and the stored food is glycogen. Hence, they show both plant and animal like characters. A kind of protozoan named Euglena contains chlorophylls and shows locomotion. It also shows both plant and animal like characters.