GCSE Biology Revision — Ecosystems & Food Chains
Revise Ecosystems & Food Chains for GCSE Biology with a topic explanation, worked example and common mistakes. Check the board notes for specification differences.
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What 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 examples
Worked 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.
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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.