Question
Why does the rate of photosynthesis decrease at higher temperatures?

Answer

Temperature does not influence light reactions of photosynthesis but affects the enzyme controlled dark reactions. The optimum temperature for photosynthesis is 18 to 35°C. When temperature is increased from minimum to optimum, the rate of photosynthesis doubles for every 10°C rise in temperature. Above the optimum temperature, the rate of photosynthesis shows an initial increase for short duration but later declines.

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