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From individuals to ecosystems

From individuals to ecosystems

Three bird species feeding in different zones of the same tree, showing how organisms can share a habitat while occupying different niches

4.1 Ecosystems Lesson

  1. GCSE
  2. /Biology
  3. /4.1 Ecosystems

Step-by-step lessons on OCR GCSE Biology 4.1 Ecosystems, covering 4.1.1 Cycling of materials in ecosystems, 4.1.2 Microorganisms in cycling materials, 4.1.3 The carbon and water cycles, 4.1.4 Factors affecting decomposition, 4.1.5 Levels of organisation in an ecosystem, 4.1.6 Abiotic and biotic factors affecting communities, 4.1.7 Interdependence and competition, 4.1.8 Trophic levels, 4.1.9 Pyramids of biomass, and 4.1.10 Efficiency of biomass transfers. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

Lessons