[2003]
(a) influx of calcium ions
(b) influx of potassium ions
(c) efflux of potassium ions
(d) influx of hydrogen ions
(b) During day time, due to photosynthesis, malic acid forms, which breaks into $H^{+}$and malate. $H^{+}$ions move out of guard cells and $K^{+}$ions enter forming potassium malate which makes guard cells turgid and stomata opens.
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