9 Ecosystems and material cycles

Practice questions on Ecosystems and material cycles

• Explain how water content and oxygen availability affect the rate of decomposition of dead… (4 marks, Explain)
• Explain the role of nitrogen-fixing bacteria and denitrifying bacteria in the nitrogen cyc… (4 marks, Explain)
• Explain how the use of fertilisers can help improve food security, and describe one proble… (4 marks, Explain)
• Explain how fish farming can help improve food security. (4 marks, Explain)
• Explain how decomposers and nitrifying bacteria work together to make nitrogen available f… (4 marks, Explain)
• Explain how both abiotic and biotic factors can affect the size of a population of rabbits… (4 marks, Explain)
• Explain what is meant by interdependence and describe how the removal of one species from … (4 marks, Explain)
• Describe how nitrogen-fixing bacteria and nitrifying bacteria contribute to making nitroge… (4 marks, Describe)
• Explain the role of decomposers and nitrifying bacteria in making nitrogen available for p… (4 marks, Explain)
• Explain how the carbon cycle returns carbon dioxide to the atmosphere after a plant dies a… (4 marks, Explain)
• Explain why an increase in the global human population is a threat to food security. (4 marks, Explain)
• Explain how using crop rotation can help improve food security. (4 marks, Explain)
• Explain how using biological control can help improve food security. (4 marks, Explain)
• Explain how carbon from carbon dioxide in the atmosphere is transferred into the bodies of… (4 marks, Explain)
• Explain how the combustion of fossil fuels and the process of photosynthesis affect the co… (4 marks, Explain)