B4.1b explain the role of microorganisms in 19: organisation of 257, the cycling of materials through an an ecosystem 260, 261 ecosystem (producers consumers and decomposers), 19: organisation of an ecosystem (decomposition) B4.1c explain the importance of the carbon 19: organisation of 258-260 cycle and the water cycle to living an ecosystem organisms (materials cycling) B4.1d explain the effect of factors such 19: organisation of 260, 261 terms aerobic and  as temperature, water content, and oxygen an ecosystem anaerobic not used here availability on rate of decomposition (decomposition) B4.1e describe different levels of 19: organisation of 251 organisation in an ecosystem from an ecosystem (levels individual organisms to the whole of organisation) ecosystem B4.1f explain how abiotic and biotic factors 18: adaptations, 239 -242 can affect communities interdependence and competition B4.1g describe the importance of 18: adaptations, 236-238 interdependence and competition in a interdependence and community competition B4.1h describe the differences between 19: organisation of 256, 257,  the trophic levels of organisms within an an ecosystem 288 ecosystem (producers consumers and decomposers) 21: trophic levels in an ecosystem (trophic levels) B4.1i pyramids of biomass and 21: trophic levels in 288, 289 describe explain, with examples, how biomass is lost an ecosystem between the different trophic levels (pyramids of biomass) B4.1j calculate the efficiency of biomass 21: trophic levels in 290  transfers between trophic levels and explain an ecosystem how this affects the number of trophic levels (transfer of biomass) in a food chain BM4.1i calculate rate changes in the 19: organisation of 261, 262  decay of biological material an ecosystem (required practical 10) BM4.1ii calculate the percentage of mass working scientifically: 294 percentages dealing with data (energy calculations) BM4.1iii Use fractions and percentages working scientifically: 294 dealing with data (energy calculations) BM4.1iv plot and draw appropriate graphs working scientifically: 209, 210 selecting appropriate scales for the axes dealing with data (data types and graphs)
B4.1b explain the role of microorganisms in the cycling of materials through an ecosystem 19: organisation of an ecosystem (producers consumers and decomposers), 19: organisation of an ecosystem (decomposition) 257, 260, 261 B4.1c explain the importance of the carbon cycle and the water cycle to living organisms 19: organisation of an ecosystem (materials cycling) 258-260 B4.1d  explain the effect of factors such as temperature, water content, and oxygen availability on rate of decomposition 19: organisation of an ecosystem (decomposition) 260, 261 terms aerobic and anaerobic not used here B4.1e describe different levels of organisation in an ecosystem from individual organisms to the whole ecosystem 19: organisation of an ecosystem (levels of organisation) 251 B4.1f explain how abiotic and biotic factors can affect communities 18: adaptations, interdependence and competition 239 -242 B4.1g describe the importance of interdependence and competition in a community 18: adaptations, interdependence and competition 236-238 B4.1h  describe the differences between the trophic levels of organisms within an ecosystem 19: organisation of an ecosystem (producers consumers and decomposers) 21: trophic levels in an ecosystem (trophic levels) 256, 257, 288 B4.1i describe pyramids of biomass and explain, with examples, how biomass is lost between the different trophic levels 21: trophic levels in an ecosystem (pyramids of biomass) 288, 289 B4.1j  calculate the efficiency of biomass transfers between trophic levels and explain how this affects the number of trophic levels in a food chain 21: trophic levels in an ecosystem (transfer of biomass) 290 BM4.1i  calculate rate changes in the decay of biological material 19: organisation of an ecosystem (required practical 10) 261, 262 BM4.1ii calculate the percentage of mass working scientifically: dealing with data (energy calculations) 294 percentages BM4.1iii Use fractions and percentages working scientifically: dealing with data (energy calculations) 294 BM4.1iv plot and draw appropriate graphs selecting appropriate scales for the axes working scientifically: dealing with data (data types and graphs) 209, 210
470131-switching-to-ocr-gcse-9-1-biology-a-from-aqa.docx