O-LevelBiologyEcology & Environment5090/12 · Oct/Nov 2016 · Q271 Mark

The diagram shows an industrial fermenter. [Diagram for Q27] Why is sterile air essential for the microorganisms in the fermenter?

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.

Ato lower the temperature

Bto maintain the fungus in suspension

Cto provide oxygen

Dto stir the microorganisms and nutrients

✓ Correct answer

C: to provide oxygen

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2016 Paper 1 Variant 2, question 27.

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