Write an experiment to show that water is necessary for photosynthesis.
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1. Place a funnel over Elodea, a pond weed, in a beaker of freshwater.
2. The funnel is raised off the bottom on pieces of blue-tack to allow unhampered diffusion of CO2 to Elodea.
3. Invert a test tube full of water over the stem of the funnel to collect any gas from the Elodea.
4. Leave for 6 hours at room temperature (20°C).
5. A colourless gas is collected in each. This gas is oxygen.