O-LevelBiologyEcology & Environment5090/12 · May/June 2017 · Q251 Mark
An experiment is set up as shown in the diagram, to compare how well different antibiotics work against a species of bacterium. In this experiment, which conditions must be kept constant?
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.
A✓, ✓, X
B✓, X, X
C✓, X, ✓
DX, X, ✓
✓ Correct answer
A: ✓, ✓, X
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