O-LevelBiologyEcology & Environment5090/11 · May/June 2013 · Q301 Mark

The diagram shows part of the nitrogen cycle. [Figure showing a nitrogen cycle diagram with 'nitrogen compounds in plants' leading to 'nitrogen compounds in animals' via P. 'nitrogen compounds in animals' leading to 'ammonium compounds' via Q. 'ammonium compounds' leading to 'nitrates' via R. 'nitrates' leading to 'nitrogen compounds in plants' via S.] Which stages depend on bacteria?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AP, Q, R and S

BP and S only

CQ and R only

DR and S only

✓ Correct answer

C: Q and R only

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2013 Paper 1 Variant 1, question 30.

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