AQA Biology Ecosystems Revision Notes
Master AQA Biology Ecosystems using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Ecosystems are dynamic systems that consist of living organisms interacting with their physical environment. They include both biotic (living) and abiotic (non-living) components, which together form complex networks of interactions.
Key Concepts
- 1Ecosystems consist of biotic and abiotic components.
- 2Energy flows through ecosystems via food chains and food webs.
- 3Nutrient cycling is essential for ecosystem sustainability.
- 4Biodiversity contributes to ecosystem resilience.
- 5Human activities can significantly impact ecosystems.
Simple Explanation
An ecosystem is a community of living things, like plants and animals, that interact with each other and their environment, such as soil and water. These interactions create a balanced system where energy and nutrients are shared. When one part of the ecosystem changes, it can affect everything else in that system.
Memory Trick
“Remember 'BENCH' for Ecosystems: Biodiversity, Energy flow, Nutrient cycling, Community interactions, Habitat.”
Flashcards
What are the two main components of an ecosystem?
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Exam Questions
Describe and explain the role of decomposers in an ecosystem. [6 marks]
6 marksView mark scheme hint▾
Mention types of decomposers, their function in nutrient cycling, and examples.
Explain how energy is transferred through a food chain. [4 marks]
4 marksView mark scheme hint▾
Discuss producers, consumers, and energy loss at each trophic level.
What is meant by biodiversity? [2 marks]
2 marksView mark scheme hint▾
Define biodiversity and its importance in ecosystems.
Practice Quiz
What is the main process by which energy enters an ecosystem?
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