1.3.12

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

1Biology

1.1Cells, Tissues & Organs

1.2Reproduction & Variation

1.3Ecological Relationships & Classification

1.4Digestion & Nutrition

1.5Plants & Photosynthesis

1.6Biological Systems & Processes

2Chemistry

2.1Particles

2.2Chemical Reactions

2.3Atoms, Elements, Compounds

2.4The Periodic Table

2.5Materials & the Earth

2.6Reactivity

2.7Energetics

2.8Properties of Materials

3Physics

3.1Energy

3.2Forces & Motion

3.3Waves

3.4Electricity & Magnetism

3.5Matter

3.6Space Physics

4Thinking Scientifically

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