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Five Kingdom Classification

Organisms are divided into five major kingdoms. R.H Whittaker proposed the five kingdom classification in 1969. The most common system of classification in use today is the Five Kingdom Classification. In this system all living organisms are divided into five kingdoms: 

The classification of living organisms according to Whittaker into five kingdoms namely are as follows: 

KINGDOM: MONERA 

Kingdo Monera - It consists of primitive organisms. The organisms are very small and single celled. They consists of prokarytotes which includes species like the bacteria, archae bacteria, cyanobacteria and mycoplasma.  

Example: bacteria.

KINGDOM: PROTISTA 

Protista are single-celled eukaryotes and are mainlky aquatic. It includes diatoms, golden algae, euglena and protozoans like amoeba, paramoecium, plasmodium etc. They are mostly marine and photosynthetic.

 Example: paramoecium

KINGDOM: MYCOTA 

Kingdom Mycota or Kingdom Fungi consists of network of thread-like structures called as mycelium. The bodies consists of long, thread-like structures which are called hyphae. These organisms are mostly saprophytes or parasites and also symbionts. This kingdom of fungi also includes lichens, mycorrhiza, etc.

 Example: aspergillus

KINGDOM: METAPHYTA 

Kingdom Metaphyta or Kingdom Plantae are eukaryotic, mutlicellular plants, They contain chlororphyll pigment, which helps them prepare their own food by the process of photosynthesis. This kingdom includes all types of plants like herbs, shrubs, trees, flowering and non flowering plants.

 Example: rose plant, mango tree, etc.

KINGDOM: METAZOA 

Kingdom Animalia or Kingdom Metazoa are heterotrophic, eukaryotic, multicellular organisms. They lack cell wall. This kingdom includes all types of animals.

 Example: lion, peacock, etc.

Classification of Organisms under Five Kingdom

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Merits of Five Kingdom Classification

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Merits of R.H Whittaker 5 Kingdom Classification:
  • This system of classification is more scientific and natural.
  • It is the most accepted system of modern classification as the different groups of animals are placed phylogenetically.
  • The prokaryotes are placed in a separate kingdom as they differ from all other organisms in their organization. 
  • As the unicellular organisms are placed under the kingdom protista, it has solved many problem related to the position of organisms like euglena. 
  • The fungi totally differ from other primitive eukarytotes hence, placing the group fungi in a status of kingdom is justifiable. 
  • The kingdom Plantae and Animalia shows the phylogeny of different life styles, in the five kingdom classification, they are more homogeneous group than the two kingdom classification. 
  • This system of classification clearly indicates cellular organization and modes of nutrition, the character which have appeared very early in the evolution of life. 

Demerits of Five Kingdom Classification

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Demerits of R.H. Whittaker 5 Kingdom Classification:
  • This system of classification has drawbacks with reference to the lower forms of life. 
  • The Kingdom of Monerans and the Protists include diverse, heterogenous forms of life. In both the kingdoms there are autoptrophic and hetertrophic organisms. They also include organisms which have cells with cell wall and cells without cell wall. 
  • All the organisms of these three kingdoms do not originate from a single ancestor.
  • Multicellular organisms have originated from protists several times.
  • Organisms like the unicelluar green algae like volvox and chlamydomonas have not been included under the Kingdom Protista because of their resemblance to other greeen algae. 
  • The general organization of the slime moulds are completely different from the members of protists. 
  • In this system of classification viruses have not been given proper place.
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