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The correct answer is option 1: Stomatal opening.
Conversion of starch to sugar is essential for stomatal opening because starch is a storage form of carbohydrates in plants, while sugar is the form that is readily available for energy production. Stomata are small openings on the surface of leaves that allow for gas exchange, including the uptake of carbon dioxide needed for photosynthesis. Before stomata can open, they need a supply of energy, which is provided by converting stored starch into sugar. Once the sugar is produced, it can be used for various metabolic processes, including supplying the energy needed for stomatal opening. Therefore, the conversion of starch to sugar is necessary for stomatal opening and efficient gas exchange in plants.