DENDROLOGY

Detailed explanation-1: -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-2: -In many plants, when the outside temperature is warm and water evaporates more readily, plants close their stomata to prevent excessive water loss.

Detailed explanation-3: -Stomata open and close as a result of diffusion. Under hot and dry conditions, when water loss due to evaporation is high, stomata must close to prevent dehydration.

Detailed explanation-4: -When temperature increases, the viscosity of water declines and mesophyll conductance (gm) increases, which may improve the supply of water to sites of evaporation and thus increase stomatal aperture (Cochard et al., 2000; von Caemmerer and Evans, 2015).

Detailed explanation-5: -Stomatal closure is the first reaction to drought stress in most plants. Stomatal closure prevents water loss from transpirational pathways.