To meet the global demand for food, intensive livestock farming is often employed. In these systems, animals such as calves or poultry are housed in heated, confined indoor pens to restrict their movement. Which of the following is the primary biological reason why these specific conditions increase the efficiency of energy transfer to humans?
Confined, warm conditions minimize the energy lost by the livestock through respiration for movement and thermoregulation, thereby increasing net secondary productivity.
Restricting movement and maintaining a warm environment increases the assimilation efficiency of the livestock, reducing the proportion of energy lost as faeces.
The artificial conditions alter the trophic level of the livestock, allowing them to function as primary decomposers and access a wider energy pool.
Heating the indoor pens increases the Net Primary Productivity (NPPNPPNPP) of the forage crops consumed by the animals, leading to higher gross energy intake.
25 exam-style questions on OCR GCSE Biology 6.2 Feeding the human race, covering 6.2.1 Biological factors affecting food security, 6.2.2 Agricultural solutions to growing demand, 6.2.3 Selective breeding, 6.2.4 Genetic engineering, 6.2.5 Steps in genetic engineering, 6.2.6 Benefits and risks of gene technology in agriculture, and 6.2.7 Biotechnological solutions to growing demand. Each one has a worked solution and a mark scheme showing where the marks go.