Which of the following elemental ions plays a critical role in opening and closing of stomata?

Question

Quizplus · Accepted Answer

Potassium ions are essential for stomatal opening and closing. When the guard cells accumulate potassium ions, they accumulate water and swell, which leads to stomatal opening. On the other hand, when there is a shortage of potassium ions, the guard cells release water and deflate, resulting in stomatal closure.

Which of the Following Elemental Ions Plays a Critical Role