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Level of organisation
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The hierarchy of biological organisation

The hierarchy of biological organisation

Hierarchy from organelle to cell to tissue to organ to organ system with examples mitochondrion, muscle cell, muscle tissue, heart and circulatory system

Multicellular organisms are organised in levels. Small structures combine to make larger ones, and each level has a particular function.

Level of organisation Lesson

  1. IGCSE
  2. /Biology
  3. /Level of organisation

Step-by-step lessons covering Edexcel IGCSE Biology Level of organisation for IGCSE Biology. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Start with the foundational cell biology and core content before moving on to the more data-heavy ecology, genetics and practical-skills topics, which carry a large share of the exam marks.