In a food chain, only a fraction of the biomass from one trophic level is transferred to the subsequent trophic level. Which of the following sets of processes represents pathways by which biomass is lost and not passed on to the next consumer?
Transpiration, egestion, and respiration.
Egestion, excretion, and respiration.
Photosynthesis, excretion, and growth.
Ingestion, transpiration, and assimilation.
67 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.