Even though water is one of the reactants in the light reaction, the effect of water as a factor is more through its effect on the plant, rather than directly on photosynthesis. Water stress causes the stomata to close hence reducing the CO₂ availability. Besides, water stress also makes leaves wilt, thus, reducing the surface area of the leaves and their metabolic activity as well.
Assertion (A): Water stress affects photosynthesis through multiple pathways. Reason (R): Water stress causes leaf wilting, reducing surface area and metabolic activity of leaves.
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