Question

Stomatal movement is controlled by

• A. Na
• B. Mg
• C. K
• D. P

Answer 1

The correct option is C K

Potassium is absorbed as potassium ion ($K^{+}$). In plants, this is required in more abundant quantities in the meristematic tissues, buds, leaves and root tips. Potassium helps to maintain an anion-cation balance in cells and is involved in protein synthesis, opening and closing of stomata, activation of enzymes and in the maintenance of the turgidity of cells.