Posts Tagged ‘ science experiment ’

Germ Experiment — Where Do Germs Grow in Your House??!

Monday, March 5th, 2012

Germ Experiment: I saw this germ experiment on Homeschool Share and knew we had to add this into our unit on First Aid. After all keeping ourselves healthy is as important as patching up the injuries, right?!

The experiment called for gelatin, sugar and petri dishes. We didn’t have petri dishes so used paper cups and covered them immediately with glad wrap in lieu of a cover.

  • Boil 1/2 cup of water
  • Add 2 tsp of sugar and 2 tsp of unflavored gelatin
  • Stir until dissolved. Spoon into the cups (I had about 1 cm or 1/4 inch of gelatin in each cup.)
  • Cover immediately with Glad wrap to keep it clean and as uncontaminated as possible.
  • Chill for 24 hours

The next day: Label each cup. Then go around the house with cotton swabs and choose areas to collect germs.  Take a swab of the area. Rub the swab gently on the top of the gelatin. We chose to swab the following: the toilet, a door knob, nothing (as a control), a plant, the kitchen sink, the inside of LD’s mouth.

Set it aside in a dark, warm place for 5 or 6 days.  I stuck mine under the sink in the guest bathroom.

The results really, really surprised me!  So, of all the things we did what do you think had the most germ growth?

  • the toilet,
  • a door knob,
  • nothing (as a control),
  • a plant,
  • the kitchen sink,
  • the inside of LD’s mouth

LD and ED thought the toilet would have the most germs.
DD thought the inside of the mouth would have the most germs.
Dad and I have seen shows and thought the kitchen sink would have the most germs.

And the winner was…

the plant!! (center pic) Followed by the
sink (top left) and door knob (top right)
and the mouth, toilet and nothing coming in 4th, 5th and 6th places.
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