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Aim
Investigate the effects of light intensity, light wavelength, temperature and availability of carbon dioxide on the rate of photosynthesis using a suitable aquatic plant.
Equipment
Pondweed
Beaker
Sodium hydrogen carbonate
Aluminum foil
Spatula
Light filters
Photosynthometer
Paperclip
Bench lamp
Ruler
Thermometer
Stop clock
Method
Place a piece of pondweed in a beaker of water.
Cover one side of the beaker with the aluminium foil to block out the light.
Cover the other side of the beaker with one of the light filters.
Add sodium hydrogencarbonate in excess to the water to provide carbon dioxide.
Leave for 5 minutes.
Place the bench lamp a set distance from the beaker.
Set up the photosynthometer. Leave for 5 minutes.
Record the volume of gas produced during this time.
Replace the filter with another colour of filter and repeat the experiment.
Rate of photosynthesis
Volume of oxygen produce/time
