6.4.1

Classification of Living Organisms

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Classification Systems

Classification groups organisms by comparing their similarities and differences:

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Traditional (Linnaean) classification system

  • The traditional classification system, devised by Carl Linnaeus, categorises organisms based on their structure and characteristics.
  • He created 7 different groups - Kingdom, Phylum, Class, Order, Family, Genus, Species.
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3-domain system

  • Carl Woese proposed the 3 domain system. This classifies organisms based on chemical analysis.
  • The 3 domains are:
    • Archaea - primitive bacteria.
    • Bacteria - true bacteria.
    • Eukaryota - organisms possessing complex sub-cellular structures (protists, fungi, plants and animals).

Jump to other topics

1Cell Biology

2Organisation

2.1Principles of Organisation

2.2Enzymes

2.3Circulatory System

2.4Non-Communicable Diseases

2.5Plant Tissues, Organs & Systems

3Infection & Response

4Bioenergetics

5Homeostasis & Response

6Inheritance, Variation & Evolution

7Ecology

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