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Investigating the effect of light  

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Investigating the effect of light intensity on photosynthesis in a pondweed Aim: To investigate how the rate of photosynthesis changes at different light intensities, with a pondweed. Prediction: I predict that the oxygen bubbles will decrease when the lamp is further away from the measuring cylinder, because light intensity is a factor of photosynthesis. The plant may stop photosynthesising when the pondweed is at the furthest distance from the lamp (8cm). Without light, the plant will stop the photosynthesising process, because, light is a limited factor. However once a particular light intensity is reached the rate of photosynthesis stays constant, even if the light intensity is the greatest. If I plot distance of the lamp, against the number of bubbles per 2 minuets, I will get a straight linear graph which will not go through the origin. Introduction: Photosynthesis is the process by which green plants use light to synthesize organic compounds from carbon dioxide...

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