O-LevelBiologyEcology & Environment5090/12 · Oct/Nov 2021 · Q321 Mark

The table shows the source and the effect of four air pollutants. [Table 32.1] What are the four pollutants?

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Acarbon dioxide, methane, nitrogen oxides, sulfur dioxide

Bsulfur dioxide, carbon dioxide, methane, nitrogen oxides

Cmethane, sulfur dioxide, nitrogen oxides, carbon dioxide

Dsulfur dioxide, carbon dioxide, nitrogen oxides, methane

✓ Correct answer

B: sulfur dioxide, carbon dioxide, methane, nitrogen oxides

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2021 Paper 1 Variant 2, question 32.

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