A-LevelBiologyBiodiversity and conservation9700/12 · Oct/Nov 2015 · Q401 Mark

Anaerobic bacteria are found in large numbers in waterlogged soils. Which effect does this have on soil fertility and why?

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, Oct/Nov 2015 Paper 1 Variant 2, question 40.

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