NEET Biology Biological Classification
Biological Classification PDF Notes, Important Questions and Synopsis
- Different classification systems proposed by scientists:
Two Kingdom Classification
- Linnaeus (1758) divided all organisms into two kingdoms—Plantae and Animalia
Three Kingdom Classification
- Haeckel (1866) created a new kingdom Protista having only unicellular eukaryotes.
Four Kingdom Classification
- Copeland (1956) placed prokaryotes under a separate kingdom named Monera.
Five Kingdom Classification
- R.H. Whittaker (1969) classified organisms into five kingdoms—Monera, Protista, Plantae, Fungi and Animalia.
Six Kingdom Classification
- Carl Woese proposed the three domain system—Archae (Archaebacteria), Bacteria (Eubacteria), Eukarya (Plantae, Animalia, Protista, Fungi).
- Classification of Kingdom Protista:
- Classification of Kingdom Fungi:
- Classification of Kingdom Monera:
Viruses are non-cellular organisms characterised by an inert crystalline structure outside the living cell.
Viroids are infectious RNA particles which lack a protein coat.
Prions are infectious proteinaceous agents which lack genetic material.
Lichens are the symbiotic association between an alga (phycobiont) and a fungus (mycobiont).
Different classification systems proposed by scientists:
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