Scientists have produced a GM crop that is resistant to a herbicide (weedkiller).
Which statement explains how growing this crop could increase yield?
The crop releases herbicide, so weeds cannot grow near its roots
The herbicide acts as a fertiliser, so the crop photosynthesises faster
Insect pests are killed by the herbicide, so less of the crop is eaten
Weeds are killed without harming the crop, so there is less competition
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.