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# The affect of light on the rate ofphotosynthesis of a piece of pondweed.

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Introduction

Photosynthesis Investigation Investigate the affect of light on the rate of photosynthesis of a piece of pondweed I am going to investigate how light will affect the rate of photosynthesis of pondweed. I predict that as the light becomes less intense, I do this by moving the light away from the pondweed, the rate of photosynthesis will decrease. The formula for photosynthesis is: 6CO2 + 6H2O C6O12H6 + 6O2 Carbon Dioxide + Water Glucose + Oxygen There are 3 major factors that limit the rate of photosynthesis, these are: * Temperature * Amount of Carbon Dioxide * Light Intensity The only factor that we are able to measure successfully in school is the affect of light on the rate of photosynthesis, so we have to believe that the level will remain the same. ...read more.

Middle

Equipment: * 1 piece of pondweed * 1 250ml Pyrex beaker * 1 stop clock * 1 ruler * 1 60 watt light bulb * 1 stand * 1 boss clamp * a pair of scissors * 175ml tap water To be set up as shown below: * Attach the bulb to the boss clamp and then attach that to the stand then plug the light in and turn it on. * Cut a piece of pondweed and make a clean diagonal cut at one end so all the oxygen bubbles can escape. Leave the plant in the same position throughout the experiment. * Put the pondweed into the Pyrex beaker and fill the beaker with about 175ml of tap water (it must cover the plant). ...read more.

Conclusion

Some of the reasons may have been the temperature, we no that a light bulb gives out heat so this heat would have messed up the results. The amount of light coming into the room probably changed along with the amount of carbon dioxide in the room. I thought the experiment was reasonably successful. There are some things I could have done to receive better results. I.e. taking readings from 5cms to 50cms that way I should get a smoother curve on my graphs. I could take more reading and give the plant longer to acclimatise. I would like to do the test in a stable environment, in which I could control the amount of carbon dioxide and temperature. So it will be at the same level every time. ...read more.

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