Nitrogenous fertilisers are used extensively in modern farming. If rainwater washes excess fertiliser into a nearby lake, a process called eutrophication may occur. Three of the stages of eutrophication are described below. P Water plants growing on the lake bed die due to lack of sunlight. Q An excessive growth of algae occurs. R Excessive bacterial activity causes a reduction in oxygen levels. In which order do these three stages occur?

Q: What topic does this question test?

This question tests Nitrogen and sulfur in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2011 examination, Paper 1 Variant 2 (9701_w11_qp_12.pdf).

Question

Nitrogenous fertilisers are used extensively in modern farming. If rainwater washes excess fertiliser into a nearby lake, a process called eutrophication may occur. Three of the stages of eutrophication are described below. P Water plants growing on the lake bed die due to lack of sunlight. Q An excessive growth of algae occurs. R Excessive bacterial activity causes a reduction in oxygen levels. In which order do these three stages occur?

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The correct answer is C: Q → P → R.

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