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Biology Aim of the Experiment The aim if this experiment is to see if changing one of the variables of photosynthesis will affect the pondweeds rate of photosynthesis. Variables that can affect the rate of photosynthesis: Light duration Photosynthesis is only affected by light duration in that it only occurs during periods of light. Light intensity Very high light intensities may bleach chlorophyll and so make photosynthesis impossible. Carbon dioxide concentration CO2 diffuses into the leaf through the stomata from the atmosphere. This is one of the main things used in photosynthesis and without it photosynthesis can't take place. Temperature Many reactions within photosynthesis are controlled by enzymes and therefore temperature sensitive. Enzymes work best at 37.5? and stop working at about 47? because they start dying. Chlorophyll concentration Chlorophyll is one of the main chemicals used in photosynthesis. Chlorophyll is not normally a limiting factor but it can become one if the levels are abnormally low. Iron,...

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