A-LevelBiologyBiodiversity and conservation9700/12 · May/June 2010 · Q91 Mark

The diagram shows part of the nitrogen cycle. [Figure 9.1] Which sequence of numbers correctly shows the roles of different types of microorganism in the nitrogen cycle?

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Adecomposing (putrefying) bacteria: 2; denitrifying bacteria: 4; nitrifying bacteria: 3

Bdecomposing (putrefying) bacteria: 3; denitrifying bacteria: 1; nitrifying bacteria: 2

Cdecomposing (putrefying) bacteria: 3; denitrifying bacteria: 1; nitrifying bacteria: 4

Ddecomposing (putrefying) bacteria: 4; denitrifying bacteria: 2; nitrifying bacteria: 1

✓ Correct answer

C: decomposing (putrefying) bacteria: 3; denitrifying bacteria: 1; nitrifying bacteria: 4

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Topic: Biodiversity and conservation, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2010 Paper 1 Variant 2, question 9.

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