A population replaces some cereal meals with meat from animals fed on the same cereal.
Why could this increase the area of farmland needed?
Animals transfer all food energy into edible tissue.
Animals lose some food energy before tissue is eaten.
Animals recycle lost heat energy into edible tissue.
Animals store more energy than their food contains.
38 exam-style questions on Edexcel GCSE Biology 9.2 Energy transfer and biodiversity, covering 9.2.1 Energy transfer between trophic levels, 9.2.2 Efficiency of energy transfers, 9.2.3 Human interactions and biodiversity, 9.2.4 Benefits of maintaining biodiversity, and 9.2.5 Biological factors affecting food security. Each one has a worked solution and a mark scheme showing where the marks go.