Pearson Edexcel International GCSE Biology (4BI1) · EDEXCEL 4BI1
4 Ecology and the environment
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Practice questions on Ecology and the environment
- Explain how methane and carbon dioxide act as greenhouse gases to cause global warming. (4 marks, Explain)
- Describe the process of eutrophication and explain how it leads to a reduction in the numb… (4 marks, Describe and Explain)
- Describe the effects of deforestation on the carbon cycle and explain how these effects ma… (4 marks, Describe)
- Explain how carbon stored in the bodies of dead animals is returned to the atmosphere as c… (4 marks, Explain)
- Describe the role of producers in a food chain and explain what happens to the amount of b… (4 marks, Describe)
- Explain how seasonal changes in light intensity can affect the distribution of a plant pop… (4 marks, Explain)
- Explain how an increase in temperature and an increase in oxygen availability affect the r… (4 marks, Explain)
- Eutrophication is a process that can reduce biodiversity in a freshwater lake. Explain how… (4 marks, Explain)
- Describe how deforestation can contribute to global warming. (4 marks, Describe)
- Explain how the removal of a top predator from an ecosystem can affect the populations of … (4 marks, Explain)
- Explain why only around 10% of the energy available at one trophic level is transferred to… (4 marks, Explain)
- A food web in a grassland ecosystem contains the following organisms: grass, grasshoppers,… (4 marks, Describe and Explain)
- A pond ecosystem contains the following organisms: microscopic algae, water fleas, small f… (4 marks, Describe and Explain)
- Describe the role of decomposers in the carbon cycle. (4 marks, Describe)
- Explain how carbon in carbon dioxide gas in the atmosphere becomes part of the carbon comp… (4 marks, Explain)
- Explain how nitrogen from the atmosphere becomes available to a plant as nitrates in the s… (4 marks, Explain)
- Describe the role of nitrifying bacteria and denitrifying bacteria in the nitrogen cycle. (4 marks, Describe)
- Explain how the use of fertilisers on farmland can lead to the death of fish in a nearby l… (4 marks, Explain)
- Explain how deforestation can lead to an increase in global warming. (4 marks, Explain)
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