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• photosynthisis

  start by taking a boiling tube and placing it 10cm away from an LED light source

  fill the boiling tube with sodium hydrogen carbonate solution

  put a peice of pondweed in with the cut on the top

  leave for five minutes to acclimatise to the conditions in the boiling tube

  start a stopwatch and count the number of bubbles produced in one min

  repete two more times and calculate the mean number of bubbles produced

  repete increacing the distance by 10 cm