Beef cattle kept in heated sheds with limited space gain body mass faster than cattle kept in fields, even when both groups eat the same mass of food.
Which is the most complete explanation for the faster growth of the shed cattle?
They move less, so less food is used in respiration and more energy is used for new body tissue
They are warmer, so they respire faster and use the extra energy released to build new body tissue
They move less and are kept warm, so less energy is transferred to the surroundings and more to growth
They move less and are kept warm, so they need to eat more food to keep growing at the same rate
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.