Independent variable (3): The variable which is changed, The distance of the light from the pond weed, Measured in centimeters, Dependent variable (3): The variable which is measured, The rate of photosynthesis, Measured by counting the bubbles of gas in one minute, Control variable (6): Variables we must try to keep the same, Controlling these leads to a valid test, The type of pond weed, The mass of pond weed, The volume of water in the test tube, The type of light source, Sources of error (2): Heating effect due to the lamp. Use an LED or stand in water, The volume of gas in each bubble may differ but we assume it is the same,

Photosynthesis RPA

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