Explain the mechanism of opening and closing of stomata

Mechanism of opening and closing of stomata



Some plants open/unfold/unroll their stomata in day time and shut/close them in night time. It is the responsibility of stomata for transpiration and movement of guards cells via actions. The inner concave side of guard cell which opens the stomata is thicker then the outer convex side.



The two guard cells are attached at their ends and stomata is exists/present between them. When guard cells gain water and become turgid, then the stomata opens. When guard cells loose water and become flaccid, then the stomata closes.



The sunlight causes movement of potassium ion through epidermal cell to guard cells. Water also flow with these ions and enters in stomata's of guard cells. The guard cells become turgid and stomata opensun/fold/unroll. Then the stomata begin to synthesize/make glucose i.e. Become hypertonic. 



As the sun sets and sunlight starts decreasing,  the concentration of glucose also decreases. The potassium ions starts to flow back in epidermal cells and water molecules also starts to flow back to epidermal cells. The guard cells become flaccid/soft and this causes the closure of stomata. It also decreases/lower/lessen the rate of transpiration/evaporation.

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