A farmer is considering changing the rearing system used for meat goats. In the current system, the goats can move around a large unheated building. In the proposed system, partitions restrict movement and heaters maintain a constant warm temperature.
The farmer compared records from the current system with records from a trial of the proposed system. Goats of the same breed and age were reared for the same length of time.
| Rearing system | Mass of food eaten / kg | Increase in body mass / kg |
|---|---|---|
| Current system | 3150 | 630 |
| Trial of proposed system | 2520 | 630 |
The farmer has 4200 kg of food available for the next rearing period. Assume that the rates of conversion of food into body mass remain the same.
Calculate the extra increase in body mass predicted if the proposed system is used instead of the current system.
Explain how the changes in the proposed system could cause more of the food eaten to increase the body mass of the goats.
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.