O-LevelBiologyEcology & Environment5090/11 · Oct/Nov 2010 · Q251 Mark

The diagram shows part of a river into which sewage is being pumped. [Diagram] Some of the effects of adding sewage to the river are plotted in the graph. [Graph] Which graphs represent the bacteria and the oxygen content of the water? [Table]

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AW Y

BX Z

CY X

DZ W

✓ Correct answer

D: Z W

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2010 Paper 1 Variant 1, question 25.

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