O-LevelBiologyEcology & Environment5090/11 · Oct/Nov 2015 · Q271 Mark

An ocean is polluted by an oil spill. What is least likely to speed up the rate of decomposition of oil by microorganisms?

Aaerobic conditions

Bmixing by wave action

Cpresence of salt water

Dspraying the surface of the sea with warm water

✓ Correct answer

C: presence of salt water

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2015 Paper 1 Variant 1, question 27.

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