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(B) Water is a vital reactant in the process of photosynthesis. When water supply is extremely low,it leads to the wilting of leaves. Wilting causes t

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(B) Water is a vital reactant in the process of photosynthesis. When water supply is extremely low,it leads to the wilting of leaves. Wilting causes the stomata to close to prevent further water loss through transpiration. Closing of stomata restricts the entry of $CO_2$ into the leaves,which is essential for the dark reaction of photosynthesis. Additionally,water stress affects the metabolic activities of the plant and the structural integrity of the chloroplasts. Therefore,under conditions of severe water stress,the rate of photosynthesis decreases significantly.

If water supply to the plant is extremely meagre so as to cause wilting of leaves,the rate of photosynthesis may

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$A-$ The $C_3$ and $C_4$ plants respond differently to $CO_2$ concentrations.
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