Transport in Plants Question 42

42. Stomata of a plant open due to

[2003]

(a) influx of calcium ions

(b) influx of potassium ions

(c) efflux of potassium ions

(d) influx of hydrogen ions

Show Answer

Answer : b

Hints & Solutions

(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.