A farmer compared two ways of rearing young lambs.
The table shows the mean results per lamb over 30 days.
| Condition | Indoor pen | Hillside |
|---|---|---|
| Mean air temperature in °C | 18 | 8 |
| Mean distance moved per day in km | 0.6 | 3.8 |
| Mass of food eaten in kg | 42.0 | 42.0 |
| Initial body mass in kg | 24.0 | 24.0 |
| Final body mass in kg | 30.0 | 27.5 |
Calculate the increase in body mass as a percentage of the mass of food eaten for a lamb in the indoor pen and for a lamb on the hillside.
Give each answer to 3 significant figures.
Explain why the percentage for the hillside lambs is lower than the percentage for the indoor lambs.
The farmer lowers the temperature of the indoor pen to 8 °C. The lambs in the pen move the same distance and eat the same mass of food as before.
Predict whether the percentage for the indoor lambs would now be higher than, the same as or lower than the percentage for the hillside lambs.
Give a reason for your answer.
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.