Impact of environmental change (biology only) (HT only) — AQA GCSE Biology
Test yourself on Impact of environmental change (biology only) (HT only) with AQA GCSE practice questions.
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Impact of environmental change (biology only) (HT only) explained
Distribution describes where organisms of a species are found within an ecosystem.
Read the full explanation
Environmental changes can make conditions more or less suitable, so species may spread into new areas, become restricted to smaller areas, or disappear locally. To evaluate an impact you use the information provided, such as survey data, maps or graphs, and reason about how a change affects the needs of the species. For example, if a river becomes warmer, a cold-water fish may move upstream while a warm-water species extends its range. Evaluation means weighing the evidence, identifying which species benefit or suffer, and explaining the likely effect on distribution using biological ideas such as temperature tolerance, water availability and gas exchange.
Your focus
- Interpret given information about an environmental change and species distribution.
- Explain how the change affects the suitability of the ecosystem for different species.
- Reach a justified judgement about the impact on distribution using the evidence provided.
Impact of environmental change (biology only) (HT only) exam tips
Marking Points
- Define distribution as where a species is found within an ecosystem.
- Identify the environmental change described in the information and state whether it makes conditions more or less suitable.
- Link the change to the species' needs, such as temperature tolerance, water supply or oxygen availability.
- Use the given data, such as survey counts or maps, to support a judgement about how distribution changes.
- Explain that some species may increase their range while others decline or disappear locally.
- Reach a justified conclusion about the overall impact on the ecosystem.
Examiner Tips
- 💡Always refer to the data or information given in the question rather than relying on memory alone.
- 💡Use comparative language such as increased, decreased, restricted or extended when describing distribution changes.
- 💡Structure your evaluation as change, effect on species, evidence, and overall judgement.
Common Mistakes
- Describing the environmental change without linking it to species distribution; correct this by explaining how the change affects where the species can survive.
- Ignoring the provided data and giving a general answer; correct this by quoting specific figures or patterns from the information.
- Assuming all species respond in the same way; correct this by recognising that different species have different tolerances and may benefit or suffer.