O D
Disc of the
same
antibiotic x
placed on
each plate
Method
Surface
covered with
bacterium A
Surface
covered with
bacterium B
Surface
covered with
bacterium C
Clear zone no
bacteria
•
Bacterial
Incubation at 37°C for 48 hours
growth
Result
[Adapted from 2004 HSC NSW: Section - Part B Q27)
The plates were incubated at 37°C for 48 hours. The diagram of plates 1, 2 and 3
in the bottom row show the results of the investigation.
2.1 Formulate a hypothesis for this investigation.​