Equipment
Beaker
Canadian pondweed
Meter ruler
Lamp
Thermometer
Sodium hydrogen carbonate
Stopwatch
Safety
I will make sure the experiment is safe I will
Wear a lab coat
Wear safety spectacles
Make sure the lamp is stable and will not fall into the beaker as we are using water and electricity
Make sure the beaker is in the middle of the bench so it has a less likely chance of falling off and smashing
Be careful when moving the lamp because it gets very hot
Method
Place a length of Canadian pondweed in a beaker with a thermometer to ensure there is no drastic change of temperature
Put excess Sodium hydrogen carbonate in the water so the levels of CO2 will not effect the experiment
Place a light 10cm away from the beaker and leave the plant to adjust to the light for about half an hour.
Count the bubbles coming off the plant for 1 minute
Move the light 10-cm away from the light and leave for 2 minutes to adjust to the new light intensity, continue to time the bubbles for 1 min
Continue this until you reach 50 cm away
Results
Conclusion
I have concluded from this experiment that light intensity dose increase the rate of photosynthesis my results prove this because the averages decrease as you reduce the light intensity.
Evaluation
My experiment I think went well on the whole there was no points on my graph, which were drastically out of place. However I could have improved my procedure a little the experiment could have been in a room that had curtains or some means of blocking out the sun. Also the room could have the experiment should be done on the same day all at once so if it is done the next day there is no change in temperature or if it is a sunny day and a cloudy one the next. The experiment could have been affected by accidents such as knocking the table or nudging the lamp.
