O-LevelBiologyEcology & Environment5090/12 · Oct/Nov 2018 · Q251 Mark

The graph shows the effect of four different antibiotics on the growth of a population of bacteria. [Figure 25.1] Which of these statements is correct? 1 Antibiotic W is more effective than antibiotic X against these bacteria after 10 hours. 2 Antibiotic X is more effective than antibiotic Y against these bacteria. 3 Antibiotic Z is the most effective of these four antibiotics against these bacteria.

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A1 and 2

B1 and 3

C2 only

D3 only

✓ Correct answer

C: 2 only

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2018 Paper 1 Variant 2, question 25.

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