1.6 Ecosystems, nutrient cycles and human impact

Practice questions on Ecosystems, nutrient cycles and human impact

• Explain how the use of pesticides on farmland can reduce the population of organisms at hi… (4 marks, Explain)
• Explain how carbon from carbon dioxide in the atmosphere becomes part of the body of an an… (4 marks, Explain)
• Explain the role of decomposers in the carbon cycle. (4 marks, Explain)
• Describe the roles of producers and decomposers in an ecosystem. (4 marks, Describe)
• Explain how energy enters and is transferred through a food chain in an ecosystem. (4 marks, Explain)
• Explain how nitrogen from the atmosphere becomes available to plants, and why this process… (4 marks, Explain)
• Explain why a woodland ecosystem is described as self-sustaining. (4 marks, Explain)
• Explain why removing all the predators from a grassland ecosystem would affect the populat… (4 marks, Explain)
• Explain why a stable ecosystem such as a coral reef is able to support a large number of d… (4 marks, Explain)
• Describe the role of microorganisms in the nitrogen cycle. (4 marks, Describe)
• Explain why removing all the decomposers from a woodland ecosystem would eventually cause … (4 marks, Explain)
• Explain how deforestation can affect the amount of carbon dioxide in the atmosphere. (4 marks, Explain)
• Explain how burning fossil fuels can lead to damage to trees and other plants. (4 marks, Explain)
• Explain how the use of fertilisers on farmland can lead to the death of fish in nearby riv… (4 marks, Explain)
• Explain how the release of raw sewage into a river can lead to a decrease in the number of… (4 marks, Explain)