Ecosystems & Food Chains — GCSE Biology Revision
Revise Ecosystems & Food Chains for GCSE Biology. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Adaptations & InterdependenceWhat is Ecosystems & Food Chains?
An ecosystem is the interaction of a community of living organisms (biotic) with the non-living (abiotic) parts of their environment. Within an ecosystem, energy is transferred through food chains, which show what eats what. All food chains begin with a producer, an organism that makes its own food, usually a green plant that photosynthesises.
Board notes: A fundamental topic for all major boards (AQA, Edexcel, OCR). Understanding the terminology (producer, consumer, decomposer, etc.) is key.
Step-by-step explanationWorked example
A simple food chain in a garden could be: Rose bush -> Greenfly -> Ladybird -> Blue tit. The rose bush is the producer. The greenfly is the primary consumer, the ladybird is the secondary consumer, and the blue tit is the tertiary consumer.
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Common mistakes
- 1Confusing food chains and food webs. A food chain shows a single path of energy flow, while a food web consists of many interconnected food chains and shows the complex feeding relationships in an ecosystem.
- 2Drawing the arrows in a food chain the wrong way. The arrow points in the direction of energy flow, from the organism being eaten to the organism that eats it.
- 3Thinking that the top predator has the most energy. Energy is lost at each trophic level, so the producer at the bottom of the food chain contains the most energy.
Ecosystems & Food Chains exam questions
Exam-style questions for Ecosystems & Food Chains with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Ecosystems & Food Chains
Core concept
An ecosystem is the interaction of a community of living organisms (biotic) with the non-living (abiotic) parts of their environment. Within an ecosystem, energy is transferred through food chains, wh…
Frequently asked questions
What are the components of an ecosystem?
An ecosystem has biotic components (the living parts, like plants, animals, and fungi) and abiotic components (the non-living parts, like soil, temperature, and water).
What is a producer in a food chain?
A producer is an organism at the start of a food chain that produces its own food, usually through photosynthesis. Green plants and algae are the main producers on Earth.