6.4.1

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

Cell Biology

1.1

What's in Cells?

1.2

Cell Division

1.3

Transport in Cells

2

Organisation

2.1

Principles of Organisation

2.2

Enzymes

2.3

Circulatory System

2.4

Non-Communicable Diseases

2.5

Plant Tissues, Organs & Systems

3

Infection & Response

4

Bioenergetics

5

Homeostasis & Response

5.1

Homeostasis

5.2

The Human Nervous System

5.3

Hormonal Coordination in Humans

5.4

Plant Hormones

6

Inheritance, Variation & Evolution

6.1

Reproduction

6.2

Variation & Evolution

6.3

Genetics & Evolution

6.4

Classification

7

Ecology

7.1

Adaptations & Interdependence

7.2

Organisation of Ecosystems

7.3

Biodiversity

7.4

Trophic Levels

7.5

Food Production

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