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Investigating the effect of light intensity on photosynthesis

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Introduction

Investigating the effect of light intensity on photosynthesis Prediction As the light intensity increases so will the rate of photosynthesis will increases also. This is because the more if light hit's the leaf more electrons are knocked out of the chlorophyll. This is replaced by a water electron, the water electron is then broken down by photolysis (H2O = H2 + O) this produces the oxygen given off by photosynthesis (6CO2 + 6H2O = C6H12O6 + 6 O2). So the more light the more this will happen. Fair test I will make sure all another things will remain the same apart from the light intensity, I will use excess amounts of sodium hydrogen chloride to ensure the plan has enough CO2 at all times also ...read more.

Middle

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 ...read more.

Conclusion

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. Matt Hesketh. ...read more.

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