A) Water, calcium and magnesium
B) Starch, potassium and chloride ions
C) Malate, sodium and potassium ions
D) Malate, potassium and chloride ions
Correct Answer: D
Solution :
Levitt (1974) proposed the proton transport concept to explain the mechanism of opening and closing of stomata. During opening of stomata uptake of \[{{K}^{+}}\] takes place. The uptake of \[{{K}^{+}}\] is balanced by \[C{{l}^{-}}\] uptake. The malic acid dissociate into hydrogen and malate ions. The synthesis of malic acid in guard cells accompanies the influx of potassium ions.
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