O-LevelBiologyEcology & Environment5090/11 · May/June 2024 · Q401 Mark

The graph shows the concentration of oxygen in a river, measured at stations 1 to 5, each 100 m apart. There is a sewage outflow just after station 1. [Figure 40.1] At which stations are the concentrations of organic matter lowest?

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A1 and 5

B2 and 3

C3 and 4

D4 and 5

✓ Correct answer

A: 1 and 5

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2024 Paper 1 Variant 1, question 40.

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