O-LevelBiologyEcology & Environment5090/12 · Oct/Nov 2020 · Q271 Mark

A fermenter is used to produce penicillin. Why is continuous stirring necessary during the process of fermentation?

Ato keep the Penicillium in contact with fresh oxygen and nutrients

Bto move the Penicillium to the bottom of the fermenter

Cto move the Penicillium to the top of the fermenter

Dto stop the Penicillium reacting with the wall of the fermenter

✓ Correct answer

A: to keep the Penicillium in contact with fresh oxygen and nutrients

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2020 Paper 1 Variant 2, question 27.

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