How does water affect the rate of photosynthesis in plants?

How does water affect the rate of photosynthesis in plants?
Answer:
Water controls the opening and closing of stomata. The deficiency of water causes stomata to open very little or it may even remain closed. Therefore, G02 (required as a raw material for photosynthesis) cannot enter into the leaves and thus lack of water slows down the rate of photosynthesis.