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HomeWJEC GCSE BiologyBiodiversity and Ecosystems
WJEC · GCSE · Biology · Revision Notes

Biodiversity and Ecosystems

52 words · Last updated July 2026

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What you'll learn

How ecosystems work.

Key ideas

  • Producers, consumers, decomposers; energy loss up food chains.
  • Biodiversity; the carbon cycle; sampling with a quadrat.

Exam tips

  • Explain energy loss between levels.
  • Learn the carbon cycle.

Common mistakes

  • Reversing energy flow.
  • Forgetting decomposers.
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