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Aim: To investigate how light intensity affect rate of photosynthesis using elodea (pondweed). Planning: For this investigation when a pierce of elodea is illuminated 9light) by a lamp (electric) it produces small bubbles of oxygen gas as a result of photosynthesis. The number of bubbles produced per minute can be used as evidence or the measure of the rate of photosynthesis. Background information: Green plants need sunlight. They use the light energy to make a sugar called glucose. Glucose can be converted into another type of sugar called sucrose and carried to other parts of the plant in phloem vessels. Glucose can also be converted into starch and stored. Both starch and sucrose can be turned back into glucose and used in respiration. Photosynthesis happens in the mesophyll cells of leaves. There are two kinds of mesophyll cells - palisade mesophyll and spongy mesophyll. The mesophyll cells contain tiny bodies called chloroplasts, which contain a...

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