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Edexcel IGCSE Biology 4.17 Eutrophication Consequences Questions

Practise explaining eutrophication from fertiliser run-off, using river evidence to connect nitrates, algal growth, oxygen loss and biodiversity.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • link fertiliser leaching to algal blooms, decomposer increase and lower dissolved oxygen
  • interpret river nitrate or oxygen data to explain changes in biodiversity or turbidity
  • explain why excess fertiliser or water can reduce crop growth as well as pollute rivers

Edexcel IGCSE Biology 4.17 Eutrophication Consequences Questions question 1

[Maximum number: 5]

Using the recommended amount of fertiliser on a crop increases crop yield. Some farmers think that adding extra fertiliser will give an even greater crop yield.

Some farmers apply more nitrogen fertiliser and more water to their fields than are needed.

Explain the biological consequences of applying more nitrogen fertiliser and more water than needed.

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