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O-LevelBiologyEcology & Environment5090/11 · Oct/Nov 2019 · Q321 Mark

Sewage is released into a river. [Figure 32.1] Which curve represents the oxygen concentration in the river?

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AA

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CC

DD

✓ Correct answer

A: A

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About this question

Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2019 Paper 1 Variant 1, question 32.

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