A-LevelChemistryNitrogen and sulfur9701/12 · Oct/Nov 2011 · Q141 Mark
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?
AP → Q → R
BP → R → Q
CQ → P → R
DQ → R → P
✓ Correct answer
C: Q → P → R
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