Key Stage 4 Photosynthesis Investigation

The aim is to find out weather light intensity affects the rate of photosynthesis.Prediction + Theory/Hypothesis:I predict that light intsinty (brightness) does affect the rate of photosynthesis. As the intensity gets higher I expect that the rate of photosynthesis will increase, until it can’t increase any more dew to limiting factors such as Co2 levels + temperaturePlan/Method:1. Set up all equipment (see diagram).2.

Set the voltage on the power pack and then turn on the power pack.3. Time for 1 min, then, when 1 min is up, turn off the power pack.4. Use the micro-burette and record the results.

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5. Do step 2-3-4 until you reach the maximum voltage (that you want)Equipment List:* Glass block* Power pack* Light bulb* Glass beaker* Water (100ml)* Pond weed* Micro-buretteDiagram:Results:Voltage (volts)Exp. 1 OxygenCollected (cm3)Exp. 2 Oxygen collected (cm3)Exp.

3 Oxygen collected (cm3)46.2525.1515.70625.1430.

1520.55862.70100.4840.671075.45125.7055.

8512100.2075.6085.75Conclusion:From my results I can conclude that my prediction was correct. My prediction about limiting factors such as Co2 level + temperature were also correct.Evaluation:I think that my method was suitable for this investigation as you can see from my results.

I think that my investigation supports my results and my conclusion