Question

The ion controlling stomatal movement is

• A. $N{a}^{+}$
• B. $C{a}^{2+}$
• C. $M{g}^{2+}$
• D. $K^{+}$

Answer 1

The correct option is D $K^{+}$

Nutrients are essential for the growth and development of organisms such as

Potassium ( K) is required for the stomatal opening and closing.

Na is involved in membrane permeability though its essentiality has not been proved.

Ca is required for cell wall synthesis.

Mg is required for chlorophyll synthesis.

Hence, the correct answer is option D.