Multiple choice

The metal ion involved in the stomatal regulation is

  1. iron

  2. magnesium

  3. zinc

  4. potassium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Potassium ions (K+) are essential for stomatal regulation. The influx and efflux of potassium ions in guard cells change their turgor pressure, leading to the opening and closing of stomata.

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