Question Constellation Sign up for free AQA · GCSE · Biology · Higher
Marine food chain ordering
Limpets eat algae. Limpets are prey for crabs. Give the food chain for algae, crabs and limpets.
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Marking points
- 1 Gives the complete chain algae → limpets → crabs with arrows in the correct direction.
Full-mark answer
algae → limpets → crabs
Why this answer loses marks
Crabs → limpets → algae.
The arrows are reversed. Food-chain arrows run from the food or energy source to the organism that eats it.