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Germs, germ everywhere!Featured science projectScience project video

Observation

The results showed that petri dish C (water cooler) and E (door knob) had the largest bacterial growth.

Bacteria growth

Number of bacteria colonies after 5 days

A-shopping trolley

B-keyboard

C-water cooler

D-lift button

E-door knob

Number of spots

27

19

49

15

41

The graph below represents the results of our science fair project:

germs science fair project

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Complexity level:
7
Project cost ($):
20
Time required:
1 day to prepare, 5 days for the science project experiment
Material availability:
Easily found
Safety concerns:

The bacteria should be destroyed before it is disposed of, by pouring bleach into the petri dish to kill all the bacteria before disposing of them in the trash. Alternatively, use a proper biohazard disposal bag.