Question

Which is correctly matched?

• A. Passive transport - ATP
• B. Apoplast - Plasmodesmata
• C. Potassium - Closing of stomata
• D. Bakane of Rice seedling - F.Skoog

Answer 1

The correct option is C Potassium - Closing of stomata

Potassium is essential mineral element. It is one of the macronutrients. It is responsible for the closing of stomata. Potassium ions ($K^{+}$) increases the osmotic concentration of guard cells around stomata. If there is loss of $K^{+}$ ions, then osmotic concentration of guard cells decreases as compared to adjacent epidermal cells. It causes exosomosis and hence turgidity of guard cells decreases which results into the closing of stomata.