Cows and grasshoppers both eat grass.
The efficiency of biomass transfer from grass to cows is lower than from grass to grasshoppers.
Which statement explains this?
Cows photosynthesise less than grasshoppers, so less glucose is made from the grass.
Cows digest all of the cellulose, so more of the biomass is egested in their faeces.
Cows are larger than grasshoppers, so less biomass is lost from them in excretion.
Cows keep a constant body temperature, so more biomass is used up in respiration.
111 exam-style questions on OCR GCSE Biology 4.1 Ecosystems, covering 4.1.1 Cycling of materials in ecosystems, 4.1.2 Microorganisms in cycling materials, 4.1.3 The carbon and water cycles, 4.1.4 Factors affecting decomposition, 4.1.5 Levels of organisation in an ecosystem, 4.1.6 Abiotic and biotic factors affecting communities, 4.1.7 Interdependence and competition, 4.1.8 Trophic levels, 4.1.9 Pyramids of biomass, and 4.1.10 Efficiency of biomass transfers. Each one has a worked solution and a mark scheme showing where the marks go.