Towards the bottom of this page (Under Photosynthesis) experiment 1 involves measuring photosynthesis in water plants (elodea is the one they use here but other water plants also work). This works really well...we used it for high school students on the Siemens Science Challenge at UQ a few years ago! It is very clear the effect of light intensity on oxygen production.
There are lots of other cool experiments on this page too! If you try some feel free to comment here on what works and what doesn't!
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