A farmer compared two groups of chickens. Table shows the results.
Table
| Group | Mass of food eaten / kg | Increase in body mass / kg |
|---|---|---|
| Intensive (heated shed) | 12.0 | 2.4 |
| Free range (outdoors) | 12.0 | 1.5 |
What is the difference between the percentage of food mass converted to body mass by the two groups?
7.5%
60%
0.9%
37.5%
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.