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No best answer has yet been selected by mimififi. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Take some oxygenating weed from a pond and put it in a glass of ware with a funnel upside down over the top an a test tube full of water over the top of that.
Leave it on the window sill and aftre a while you should shart to catch a gas in the test tube - oxygen
You can show it's oxygen by lighting a splint or piece of paper and blowing it out. Oxygen should then re-light the glowing splint.
experiment shows
a) Plants produce oxygen
b) Test for oxygen
If you want to be really clever you can do another one but keep it covered to show the plant needs light to do this trick.