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Plan it with CORMMSS: Design an investigation (Logic Lab).
5.17 Eutrophication
Exam question
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Explain how fertiliser run-off from farmland can lead to the death of fish in a lake.
(6)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 6 marks
5.17 Eutrophication
Exam question
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What is eutrophication?
(1)Total for this question: 1 mark
5.17 Eutrophication
Exam question
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Explain why algae grow rapidly when fertiliser enters a lake.
(2)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 2 marks
5.17 Eutrophication
Exam question
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Explain why plants at the bottom of a lake die during an algal bloom.
(2)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 2 marks
5.17 Eutrophication
Exam question
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Suggest two ways farmers can reduce eutrophication.
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Total for this question: 2 marks
5.17 Eutrophication
Exam question
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Explain why eutrophication often happens in summer.
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Total for this question: 2 marks
5.17 Eutrophication
Exam question
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Illustrative data.
| Week | Algae / relative | Oxygen / mg per dm³ | Fish counted |
|---|---|---|---|
| 0 | 5 | 9 | 40 |
| 2 | 40 | 8 | 40 |
| 4 | 80 | 7 | 38 |
| 6 | 30 | 3 | 12 |
| 8 | 10 | 2 | 2 |
Describe the change in algae over the 8 weeks.
(2)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 2 marks
5.17 Eutrophication
Exam question
Mark points shown after marking
| Week | Algae / relative | Oxygen / mg per dm³ | Fish counted |
|---|---|---|---|
| 0 | 5 | 9 | 40 |
| 2 | 40 | 8 | 40 |
| 4 | 80 | 7 | 38 |
| 6 | 30 | 3 | 12 |
| 8 | 10 | 2 | 2 |
Explain why oxygen fell most between weeks 4 and 8.
(3)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 3 marks
5.17 Eutrophication
Exam question
Mark points shown after marking
| Week | Algae / relative | Oxygen / mg per dm³ | Fish counted |
|---|---|---|---|
| 0 | 5 | 9 | 40 |
| 2 | 40 | 8 | 40 |
| 4 | 80 | 7 | 38 |
| 6 | 30 | 3 | 12 |
| 8 | 10 | 2 | 2 |
Calculate the percentage of fish remaining at week 8.
(2)Total for this question: 2 marks
5.17 Eutrophication
Exam question
Mark points shown after marking
| Week | Algae / relative | Oxygen / mg per dm³ | Fish counted |
|---|---|---|---|
| 0 | 5 | 9 | 40 |
| 2 | 40 | 8 | 40 |
| 4 | 80 | 7 | 38 |
| 6 | 30 | 3 | 12 |
| 8 | 10 | 2 | 2 |
Suggest why oxygen did not fall much while algae were increasing.
(2)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 2 marks
5.17 Eutrophication
Exam question
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Explain why phosphates in detergents can cause eutrophication.
(2)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 2 marks
5.17 Eutrophication
Exam question
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Describe how eutrophication reduces biodiversity.
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Total for this question: 2 marks
5.17 Eutrophication
Exam question
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Explain why manure can cause eutrophication even though it is organic.
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Total for this question: 2 marks
5.17 Eutrophication
Exam question
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Give the two mineral ions most linked to eutrophication.
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Total for this question: 2 marks
5.17 Eutrophication
Exam question
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Compare the effects of inorganic fertiliser and manure on soil.
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Total for this question: 2 marks
