A researcher places equal masses of dead seaweed in two chambers. Both samples are kept moist and have a plentiful supply of oxygen. One chamber is at 35°C and the other is at 75°C. The seaweed decays more slowly at 75°C. Which statement explains this result?
The decomposers respire faster, so they release carbon dioxide instead of digesting
The decomposers' enzymes are denatured, so they digest the seaweed more slowly
The decomposers' enzymes work so fast that they are all used up early on
The decomposers photosynthesise more slowly, so they have less energy for decay
83 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.