A-LevelBiologyBiodiversity and conservation9700/12 · May/June 2011 · Q381 Mark

Anaerobic bacteria are abundant in waterlogged soils. Which effect does this have on soil fertility and why? [Figure: Table with columns 'soil fertility' and 'reason']

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Adecreased bacteria convert nitrate to ammonia

Bdecreased bacteria convert nitrate to nitrogen gas

Cincreased bacteria cause decomposition

Dincreased bacteria cause nitrogen fixation

✓ Correct answer

B: decreased bacteria convert nitrate to nitrogen gas

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Topic: Biodiversity and conservation, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2011 Paper 1 Variant 2, question 38.

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