opening in the daytime allows diffusion of carbon IV into the leaf for photosynthesis to take place and allows diffusion of oxygen out of the leaf
transpiration also takes place, thus cooling the leaf and facilitating uptake of water and mineral slats
Closing in the night is to conserve water in the plant especially when there is not enough water available in the soil.
Mohaissack answered the question on October 5, 2017 at 11:42
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