Air is pumped into a fermenter used to grow the fungus *Fusarium*.
What is the main reason for pumping air into the fermenter?
To supply carbon dioxide to the fungus for photosynthesis
To supply oxygen to the fungus for aerobic respiration
To supply nitrogen to the fungus so that it can make protein
To cool the mixture so that the fungal enzymes are not denatured
42 exam-style questions on AQA GCSE Biology 7.5 Food production, covering 7.5.1 Factors affecting food security, 7.5.2 Farming techniques, 7.5.3 Sustainable fisheries, and 7.5.4 Role of biotechnology. Each one has a worked solution and a mark scheme showing where the marks go.