O-LevelBiologyEcology & Environment5090/12 · Oct/Nov 2022 · Q271 Mark

Four discs, A, B, C and D, each containing a different antibiotic, were placed onto agar gel in a Petri dish. The agar gel contained E. coli bacteria. The Petri dish was then sealed and incubated for 24 hours at 35 °C. The results are shown. Which antibiotic is most effective?

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AThe antibiotic at position A.

BThe antibiotic at position B.

CThe antibiotic at position C.

DThe antibiotic at position D.

✓ Correct answer

C: The antibiotic at position C.

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2022 Paper 1 Variant 2, question 27.

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