A) Influx of calcium ions
B) Influx of potassium ions
C) Efflux of potassium ions
D) Influx of hydrogen ions
Correct Answer: B
Solution :
During day time, due to photosynthesis, the malic acid which is formed breaks to\[{{H}^{+}}\] move out of guard cells and \[{{K}^{+}}\]enter, forming potassium malate which makes the guard cells turgid and the stomata opens. Hence, the correct option is (b).
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