A factory releases warm water into a lake. The temperature of the lake water rises by 5 °C and the number of fish in the lake falls. Which explanation for the fall in the number of fish is correct?
Warmer water holds more dissolved oxygen, so the fish respire faster than normal
Warmer water holds less dissolved oxygen, so less oxygen is available for respiration
Warmer water holds more dissolved minerals, so the fish lose water by osmosis
Warmer water lets in less light, so the water plants cannot photosynthesise at all
63 exam-style questions on AQA GCSE Biology 7.1 Adaptations, interdependence and competition, covering 7.1.1 Communities, 7.1.2 Abiotic factors, 7.1.3 Biotic factors, and 7.1.4 Adaptations. Each one has a worked solution and a mark scheme showing where the marks go.