Multiple choice

Stomatal movement is caused by

  1. Mg++ ions

  2. Mn++ ions

  3. CI-ions

  4. K+ ions
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Potassium (K+) ion movement is the primary driver of stomatal movement. K+ ions are pumped into guard cells to open stomata (lowering water potential, causing water uptake) and pumped out to close them (raising water potential, causing water loss). Mg++, Mn++, and Cl- are not involved in stomatal mechanism.

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