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Photosynthesis
Photosynthesis (‘photo’= light and ‘synthesis’ = manufacture) is the process by which
plants convert light energy into chemical energy (a
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a
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Occurs in mesophyll cells and guard cells of the leaf
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Why?
1) Soluble glucose might dissolve in water around the cell and be lost from the plant
2) Solubility increases concentration of sugar in the cell and can damage the cell
Starch is insoluble, so it can be stored as starch grains in chloroplast or in tubers…
Oxygen (O2): ‘waste’ product of photosynthesis that diffuses out of the leaf via stomata
Factors that affect the Rate of Photosynthesis
1) Light Intensity- as light intensity increases, the rate of photosynthesis increases until
the plant is photosynthesizing at its maximal rate
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So a
plant will photosynthesize faster on a warm day than a cold day
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4) Weather- On hot days, stomata close to prevent water loss
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