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Does Changing the Light Intesity Affect the Rate of Photosynthesis?

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Introduction

DOES CHANGING THE LIGHT INTESITY AFFECT THE RATE OF PHOTOSYNTHESIS? Photosynthesis. This is the food process that occurs in plants. It makes Glucose and oxygen; this increases the mass of the plant making it bigger. The raw materials used to make the process are Carbon Dioxide (CO2) and water (H2O) but plain water will not do, as the plant needs minerals in the water to help it grow more. Light energy is possibly the most important element for this process to work light energy makes the plants green and is absorbed by a green substance called Chlorophyll. Word Equations. These are the word equations for this process. Prediction. I predict that the photosynthesis process will take place quicker when the lamp is closer to the jar than when it's farther away from it. ...read more.

Middle

Inside this will be a test tube filled with approximately 12% of Potassium Hydrogen Carbonate (to ensure that the weed has enough Carbon Dioxide) and the rest was filled up with water, which will be stuck to the bottom with plasticine. A lamp will be place next to it to and a ruler will be measuring the distance between the lamp and the beaker. I will also use a thermometer to keep it the same temperature. Fairness Factors. I will keep the test fair by: *Using the same volume of water throughout. *Keeping the water the same temperature. *Using the same wattage lamp all the time. Diagram. Method. To do this experiment properly you must follow these steps. ...read more.

Conclusion

I also recorded the results on the second they happened instead of waiting for a while because then the weed would have had time to stop photosynthesising and would have had to start up again before I could record the next setting. Conclusion. I put all my results into my graph which shows that what I predicted at the start of this was right, the average bubbles per minute was much higher at the start than at the end, there was a rapid drop at the start of the experiment which evened off at the end. I found out that the closer the lamp was to the weed the faster it would photosynthesise, I also found out that the following factors could also change the rate of the photosynthesis: A drop in the carbon dioxide, Or the light intensity could drop without me knowing leading to a loss of bubbles. ...read more.

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