A pond contains this food chain.
algae → water flea → stickleback → heron
Name the producer in this food chain.
Explain why all food chains must begin with a producer.
The heron is a predator. Give the meaning of the term predator.
A disease kills most of the water fleas in the pond. Suggest and explain the effect this will have on the number of sticklebacks.
38 exam-style questions on AQA GCSE Biology 7.2 Organisation of an ecosystem, covering 7.2.1 Levels of organisation, 7.2.2 How materials are cycled, 7.2.3 Decomposition, and 7.2.4 Impact of environmental change (HT only). Each one has a worked solution and a mark scheme showing where the marks go.