Levels of Organisation (Edexcel IGCSE Biology)

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Cells, Tissues, Organs & Organ Systems

  • Cells are the basic building blocks of all living organisms
  • Unicellular organisms are made from one cell, whereas multicellular organisms are made up of collections of cells
  • Cells are made up of structures called organelles, such as the nucleus, mitochondria and ribosomes
  • In complex multicellular organisms:
    • Cells are specialised to carry out particular functions
    • These specialised cells form tissues
    • The tissues form organs
    • The organs form organ systems

Different Levels of Organisation Table

Different Levels of Organisation Table, downloadable AS & A Level Biology revision notes

Different levels of organisation in organisms 1, downloadable AS & A Level Biology revision notes downloadable AS & A Level Biology revision notes

Multicellular organisms have many levels of organisation

Examples of Organ Systems in Animals & Plants Table

Tissue Examples table, IGCSE & GCSE Biology revision notes

Worked example

Typical levels of organisation question, IGCSE & GCSE Biology revision notes

The answer is B: 1 is the leaf organ, 2 is a palisade mesophyll cell and 3 is the spongy mesophyll layer

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Lára

Author: Lára

Expertise: Biology Lead

Lára graduated from Oxford University in Biological Sciences and has now been a science tutor working in the UK for several years. Lára has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning.