AP BIOLOGY

Detailed explanation-1: -This occurs because potassium ions move back out of the guard cell, followed by water that lowers the pressure in the guard cell. So, during hot and dry summer, stomata close to prevent the excessive loss of water, thereby decreasing carbon dioxide uptake.

Detailed explanation-2: -In many plants, when the outside temperature is warm and water evaporates more readily, plants close their stomata to prevent excessive water loss. Closing the stomata, however, can disrupt plant growth by preventing carbon dioxide from entering the leaves and thereby reducing photosynthesis.

Detailed explanation-3: -Despite the fact that the stomata open in response to light, they may close on a hot day in order to conserve water. This is because the heat may cause the water to evaporate out through the stomata, causing the plant to lose water, reducing the water potential inside the leaf.

Detailed explanation-4: -But when limited water is available in the soil, plants try to prevent water loss. Water loss through transpiration can be reduced by closing the stomata in the leaves using a substance called ABA. When the stomata is closed photosynthesis will decrease because no CO2 can enter through the closed stomata.

Detailed explanation-5: -Stomata will close if the plant needs water so there won’t be enough water to generate demand for stomatal opening in the guard cells; this reaction lets the plant save water. Stomata regulate the loss of water and the exchange of gas by opening and closing.