O-LevelBiologyEcology & Environment5090/12 · May/June 2015 · Q321 Mark

Which row shows a cause and an effect of eutrophication?

Athe overuse of insecticides, an algal bloom in ponds and streams

Bthe release of fertilisers, acidification of the atmosphere

Cthe release of oxides of nitrogen, warming of the atmosphere

Dthe release of sewage, anaerobic conditions in ponds and streams

✓ Correct answer

D: the release of sewage, anaerobic conditions in ponds and streams

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2015 Paper 1 Variant 2, question 32.

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