A new insect pest arrives in a country and attacks the leaves of the main food crop.
Explain how this new pest reduces the mass of food produced by the crop.
The farmers decide to spray the crop with an insecticide.
Suggest one disadvantage of using an insecticide on the crop.
Give one other biological factor, apart from pests, that can reduce food security.
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.