O-LevelBiologyEcology & Environment5090/11 · May/June 2022 · Q301 Mark

The diagram shows the nitrogen cycle. [Figure 30.1] In which stages of the nitrogen cycle are nitrogen-fixing bacteria important?

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A1 and 2

B2 and 3

C3 and 4

D4 and 5

✓ Correct answer

B: 2 and 3

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2022 Paper 1 Variant 1, question 30.

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