O-LevelBiologyEcology & Environment5090/11 · Oct/Nov 2015 · Q321 Mark

Which graph shows changes that occur in a river after being polluted by sewage?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

A[Graph A]

B[Graph B]

C[Graph C]

D[Graph D]

✓ Correct answer

A: [Graph A]

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2015 Paper 1 Variant 1, question 32.

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