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Investigating the rate of photosynthesis in pondweed Possible variables and preliminary work Variable High Explained Low Light intensity 9 mm3/min of O2 I found that changing the light intensity was good as it gave good results. 7.5 mm3/min of O2 CO2 concentration 10 mm3/min of O2 I found that concentration gave a good range of results and it would also be interesting to investigate this one. 5.8 mm3/min of O2 Temperature 8.3 mm3/min of O2 Temperature gave a small range of results and is unreliable as the temperature would always be changing. 8.4 mm3/min of O2 Volume of water 8.6 mm3/min of O2 The volume of water did not give a good range of results. 7.9 mm3/min of O2 Chosen Variable My chosen variable is concentration of CO2 because it gave me a good range of results and it is a main factor of photosynthesis. Fair Testing To keep this a fair test I will change only my chosen variable and keep all other variables the same. Safety To ensure safety I will bare...

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