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Energy and ecosystems (A-level only)
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Energy enters through producers

Energy enters through producers

Energy flow diagram showing sunlight to producers, then primary and secondary consumers, with dead organic matter and waste to decomposers and heat loss to surroundings through respiration

An ecosystem includes organisms and the non-living conditions they interact with, such as light, temperature, water and mineral ions. In most ecosystems, energy enters when producers photosynthesise and turn carbon dioxide into organic molecules.

Energy and ecosystems (A-level only) Lesson

  1. A Level
  2. /Biology
  3. /Energy and ecosystems (A-level only)

Step-by-step lessons covering AQA A Level Biology Energy and ecosystems (A-level only) for A Level Biology. Each lesson works through exam-style questions in Paper 1, Paper 2 and Paper 3 format. Build a strong foundation in cell biology and biochemistry early on, since later topics on genetics, ecology and physiology all draw on these core concepts.