Regulation of stomatal opening for letting in carbon dioxide

Gurd cells
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Stomatal opening and closing depends upon the turgidity and flaccidity of the guard cells surrounding the stomatal opening .... When co2is let in then H2O is let out due to transpiration process
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I need its explanation and its two forms
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There are two theories regarding this :
1:sugar ion concentration theory
2:k+ion concentration theory
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