In a stable community the numbers of predators and prey rise and fall in cycles. The peak in the predator numbers always comes after the peak in the prey numbers. Which statement explains this?
When predator numbers are high, more prey are eaten, so prey numbers then fall
When prey numbers are low, predators compete for food, so predator numbers fall
When predator numbers are low, fewer prey are eaten, so prey numbers then rise
When prey numbers are high, more predators survive, so predator numbers then rise
40 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.