Why does photosynthesis occur slower in boiling water than it does in room-temperature water?
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Generally, the rate of a chemical reaction doubles for each 10 degree rise in temperature. However once the temperature rises above the point in which the enzymes are denatured, photosynthesis will stop. Boiling water will rapidly kill the cells, stopping all chemical reactions including photosynthesis.
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If you put leaf material into boiling water it will most likely destroy the chlorophyll molecules, and perhaps denature the proteins in the electron transport chain, while in regular water photosynthesis would proceed normally.