A farmer reared three groups of young turkeys for three weeks.
The turkeys had the same mean body mass at the start. Each turkey received the same mass of food each day, and each food had the same energy content.
| Group | Protein in food in g per kg | Floor area per turkey in m² | Temperature in °C | Mean increase in body mass in kg |
|---|---|---|---|---|
| A | 160 | 0.60 | 18 | 1.35 |
| B | 220 | 0.60 | 18 | 1.62 |
| C | 220 | 0.20 | 24 | 1.92 |
Calculate the percentage by which the mean increase in body mass of group C was greater than the mean increase in body mass of group A.
Explain the differences in the mean increases in body mass of the three groups.
87 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.