O-LevelChemistryChemistry of the Environment5070/11 · Oct/Nov 2017 · Q251 Mark

Nitrogenous fertilisers can cause eutrophication to occur in rivers. Eutrophication involves the five stages listed. 1 The fertiliser is washed into the river. 2 Oxygen levels become depleted in the river. 3 Plants die. 4 Plants begin to decay. 5 Plants in the river grow at an increased rate. In which order do these five stages occur during eutrophication?

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A1, 2, 4, 3, 5

B1, 2, 5, 4, 3

C1, 5, 2, 3, 4

D1, 5, 3, 4, 2

✓ Correct answer

D: 1, 5, 3, 4, 2

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2017 Paper 1 Variant 1, question 25.

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