1.3.15

Classification of Living Organisms

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Classification Systems

Classification groups organisms by comparing their similarities and differences:

Traditional (Linnaean) classification system

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.
3-domain system

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
1

Biology

1.1

Cells, Tissues & Organs

1.2

Reproduction & Variation

1.3

Ecological Relationships & Classification

1.4

Digestion & Nutrition

1.5

Plants & Photosynthesis

1.6

Biological Systems & Processes

2

Chemistry

2.1

Particles

2.2

Chemical Reactions

2.3

Atoms, Elements, Compounds

2.4

The Periodic Table

2.5

Materials & the Earth

2.6

Reactivity

2.7

Energetics

2.8

Properties of Materials

3

Physics

3.1

Energy

3.2

Forces & Motion

3.3

Waves

3.4

Electricity & Magnetism

3.5

Matter

3.6

Space Physics

4

Disciplinary Knowledge

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