explain why rate of photosynthesis in plants is low both at high and low temperature?

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Solution

At very high temperature (above 40⁰C) the enzymes involved in the chemical reactions of photosynthesis get denatured and destroyed. Without enzymes the reaction cannot takes place.
When the temperature is too less the enzymes fail to get activated and move too slowly to trigger a reaction. As a result chemical reactions do not occur. For these reasons the rate of photosynthesis decreases at both very high and very low temperature.

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