O-LevelBiologyEcology & Environment5090/11 · May/June 2016 · Q321 Mark

The diagram shows a river that flows down from the mountains to the sea. Trees are cut down and removed from the shaded area. [Figure 32.1] After a rainstorm, what is the effect on the nitrate ion content at X and at Y?

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Anitrate ion content at X: increases, nitrate ion content at Y: increases

Bnitrate ion content at X: increases, nitrate ion content at Y: decreases

Cnitrate ion content at X: decreases, nitrate ion content at Y: increases

Dnitrate ion content at X: decreases, nitrate ion content at Y: decreases

✓ Correct answer

C: nitrate ion content at X: decreases, nitrate ion content at Y: increases

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2016 Paper 1 Variant 1, question 32.

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