Final answer:
Guard cells control stomatal pores, influencing photosynthesis through gas exchange.
Explanation:
Guard cells play a crucial role in regulating the stomatal pores of plants, which impacts photosynthesis. When guard cells become turgid due to water uptake facilitated by osmotic pressure and solute concentrations, stomata open, allowing for gas exchange necessary for photosynthesis. Conversely, on hot, dry days, closed guard cells conserve water but limit carbon dioxide intake, thereby reducing photosynthesis.
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