The significance of stomata opening during the day and closing at night.

The general pattern of stomatal movement is to open and close according to the circadian rhythm: open stomata for photosynthesis during the day; When photosynthesis cannot be carried out at night, water transpiration can be reduced by closing stomata.

Stomata are the "gateway" of plant transpiration and water loss, and also the "window" of gas exchange. It is a cavity surrounded by a pair of half-moon cells-guard cells. The shape of guard cells can be adjusted and the stomata can be opened and closed, which is amazing. Every time the sun rises, the pores slowly open, and air also pours into the pores, providing carbon dioxide for the leaves to make organic matter; Of course, water will also be lost through pores. When night falls, the production activities of leaves stop, most stomata contract or close, and transpiration decreases accordingly.

During the day, leaves need a lot of water and inorganic salts to produce strong substances. Transpiration can drive plants to absorb and transport water and inorganic salts upwards, and continuously transport raw materials to leaves.