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Investigate the effects of [[light]] [[intensity]] on the rate of [[photosynthesis]].
===Method===
*[[Independent Variable]] - Distance between the light source and plant.*[[Dependent Variable]] - Number of bubbles produced by the plant.*[[Control Variable]]s - Brightness of the light. Frequencies that the light emits. Ensure no other light source than the one used in the experiment. #Fill a boiling tube with 0.2% solution of sodium hydrogen carbonate.#Place a length of pond weed in the boiling tube with the cut end at the top.#Use a metre rule with zero at the light source to fix the boiling tube at 10cm from the light source.#Use a timer to count the number of bubbles produced by the pond weed.#Repeat steps three and four 6 times increasing the distance by 10cm each time.