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A-level AQA BIOLOGY
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A-level AQA BIOLOGY The flow chart shows how high nitrate concentration can affect a river. High nitrate concentration ↓ Increased growth of algae ↓ Death and decay of submerged plants rooted in the mud ↓ Reduced oxygen concentration and increased nitrate production (a) Explain how a high nitrate concentration increases the growth of algae. (2) (b) Suggest how increased growth of algae could lead to the death of the submerged plants. (2) (c) Explain how the decay of dead plants results in reduced oxygen concentration and increased nitrate production. (6) (d) Describe how the reduced oxygen concentration of the water will change the composition of the communities in the river.
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A-level AQA BIOLOGY
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A-level AQA BIOLOGY
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