GCSE Biology Revision — Trophic Levels
Revise Trophic Levels 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 Trophic Levels?
Trophic levels are the positions an organism occupies in a food chain. Producers (plants) are at Trophic Level 1. Primary consumers (herbivores) are at Trophic Level 2, secondary consumers (carnivores) are at Trophic Level 3, and so on. Decomposers break down organisms from all trophic levels.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). Pyramids of biomass and the transfer of energy between trophic levels are key concepts.
Step-by-step explanationWorked examples
Worked example
In the food chain Grass -> Rabbit -> Fox, the grass is the producer at Trophic Level 1. The rabbit is the primary consumer at Trophic Level 2. The fox is the secondary consumer at Trophic Level 3. Only about 10% of the energy from the rabbit is transferred to the fox.
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Common mistakes
- 1Starting the trophic levels at 0. The first trophic level, the producers, is always Trophic Level 1.
- 2Confusing the terms 'producer' and 'primary consumer'. Producers make their own food; primary consumers are the first to consume them.
- 3Thinking that energy is created at each level. In fact, a large proportion of energy is lost at each trophic level (e.g., through heat from respiration, movement, or uneaten parts), which is why food chains are rarely more than five levels long.
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Frequently asked questions
What is a pyramid of biomass?
A pyramid of biomass is a diagram that shows the total dry mass of organisms at each trophic level in an ecosystem. The base is always the largest, representing the producers, because biomass is lost at each successive level.
Why is energy lost between trophic levels?
Energy is lost at each trophic level because not all of the organism is eaten, some parts are indigestible, and much of the energy is used by the organism for its own life processes, like respiration and movement, and is lost as heat.