O-LevelBiologyEcology & Environment5090/11 · Oct/Nov 2013 · Q281 Mark

Which processes increase and decrease the amount of carbon dioxide in the air?

Aburning of fossil fuels respiration of plants

Bphotosynthesis in plants respiration of bacteria

Crespiration of animals photosynthesis in plants

Drespiration of bacteria burning of fossil fuels

✓ Correct answer

C: respiration of animals photosynthesis in plants

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2013 Paper 1 Variant 1, question 28.

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