O-LevelBiologyEcology & Environment5090/11 · Oct/Nov 2025 · Q201 Mark
A doctor obtains some bacteria from an infected patient. The bacteria are grown in a Petri dish containing nutrient agar jelly. The bacteria produce a grey coating on the agar jelly. The doctor then adds three paper discs, each containing a different antibiotic. The diagram shows the Petri dish 24 hours later. [Figure 20.1] What can the doctor conclude from these results?
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.
AThe bacteria causing this patient's infection are not resistant to antibiotic Y.
BAntibiotic X would be more effective than antibiotic Y for treating this patient's infection.
CThis patient is resistant to antibiotic Z.
DAntibiotic X is the least effective treatment for this patient's infection.
✓ Correct answer
A: The bacteria causing this patient's infection are not resistant to antibiotic Y.
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Ecology & Environment and see which topics are most likely to come up next.
Sign up free →