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  4. During opening of stomata, influx of K+ ions into the guard cells is accompanied with efflux of

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Q. During opening of stomata, influx of $K^+$ ions into the guard cells is accompanied with efflux of

UP CPMTUP CPMT 2012

Solution:

According to active $K^+$ ion transport theory, during day time, $CO_2$ concentration decreases due to it being used up in photosynthesis. Malic acid is formed in guard cells which dissociates into malate ions and $H^+$. $K^+$ ions exchange with $H^+$ ions from cytoplasm of guard cells.