Multiple choice

Which of the following metal ions is involved in stomata regulation?

  1. Iron ion

  2. Potassium ion

  3. Zinc ion

  4. Magnesium ion

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Opening and closure of the stomatal pore is mediated by changes in the turgor pressure of the two guard cells. The turgor pressure of guard cells is controlled by movements of large quantities of potassium ions and sugars into and out of the guard cells.

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