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A comparison on the contamination of wet and dry foodFeatured science projectScience project video


Petri dishes swabbed with samples from the cucumber slices (wet food) were observed to have more bacterial growth spots than the Petri dishes swabbed with samples from the cheese crackers (dry food).

Food type Number of bacterial coloniesfrom samples of wet and dry food
  Kitchen sink Toilet floor Car porch Garden grass
Cucumber slice 8 10 9 10
Cheese cracker 6 7 5 8

Use the graph below to plot the experimental data recorded in the table above.

wet and dry food science project

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Complexity level:
Project cost ($):
Time required:
Preparation will require one day, while observation and recording of data will be carried out over a period of three days
Material availability:
Access to laboratory equipment (eg. petri dishes)
Safety concerns:

Always follow laboratory safety guidelines and always practice sterile technique when handling microbes. Never have any food or drink at your workstation and always thoroughly wash your hands with disinfectant soap or alcohol before leaving your workstation. Always dispose of used material in a biohazard bag. If none are available, the bacteria should be destroyed with bleach before being disposed of. Proper safety measures must be followed when handling the knife.