Edexcel Biology Ecosystems Revision Notes
Master Edexcel Biology Ecosystems using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Ecosystems are communities of living organisms interacting with their physical environment. They encompass the relationships between biotic (living) and abiotic (non-living) components, and the flow of energy and nutrients through these systems.
Key Concepts
- 1Ecosystems consist of biotic and abiotic components.
- 2Energy flow through ecosystems follows the food chain/web.
- 3Nutrient cycling is essential for ecosystem sustainability.
- 4Biodiversity contributes to ecosystem resilience.
- 5Human activities can impact ecosystems negatively.
Simple Explanation
An ecosystem is like a community where plants, animals, and other living things interact with each other and their environment, such as soil and water. Energy from the sun is used by plants to grow, and animals eat these plants or other animals. Everything in an ecosystem is connected, and changes can affect the whole system.
Memory Trick
“Remember 'B.E.N.E.F.I.T' for Ecosystems: Biodiversity, Energy flow, Nutrient cycling, Ecosystem services, Food webs, Interactions, and Trophic levels.”
Flashcards
What are the two main components of an ecosystem?
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Exam Questions
Describe and explain the flow of energy through an ecosystem. [6 marks]
6 marksView mark scheme hint▾
Include producers, consumers, and energy loss at each trophic level.
Explain how biodiversity can affect the stability of an ecosystem. [4 marks]
4 marksView mark scheme hint▾
Discuss resilience, species interactions, and ecosystem services.
What is meant by the term 'niche' in an ecosystem? [2 marks]
2 marksView mark scheme hint▾
Define niche and explain its importance in ecosystems.
Practice Quiz
What is the primary function of producers in an ecosystem?
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