Question:
In a plant stomata opens due to
In a plant stomata opens due to
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Stomata open = K+ influx; Stomata close = K+ efflux.
Updated On: Jul 18, 2026
- Influx of H+ ions
- Efflux of K+ ions
- Influx of K+ ions
- Influx of Fe+ ions
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The Correct Option is C
Solution and Explanation
Step 1: Understanding stomatal mechanism.
Stomatal opening and closing are regulated by changes in turgor pressure of guard cells. This is controlled by ion movement, especially potassium ions (K+).
Step 2: Role of K+ ions.
When K+ ions actively enter guard cells, water follows by osmosis, increasing turgor pressure inside the cells. This causes the stomata to open.
Step 3: Mechanism of opening.
Light stimulates proton pumps leading to ion exchange, but the direct cause of stomatal opening is accumulation (influx) of K+ ions in guard cells.
Step 4: Evaluation of options.
Efflux of K+ causes closure, while H+ and Fe+ are not primary regulators of stomatal movement.
Step 5: Physiological consequence.
K+ influx increases osmotic potential, drawing water into guard cells and opening the pore.
Step 6: Final conclusion.
Thus, stomata open due to influx of K+ ions.
Stomatal opening and closing are regulated by changes in turgor pressure of guard cells. This is controlled by ion movement, especially potassium ions (K+).
Step 2: Role of K+ ions.
When K+ ions actively enter guard cells, water follows by osmosis, increasing turgor pressure inside the cells. This causes the stomata to open.
Step 3: Mechanism of opening.
Light stimulates proton pumps leading to ion exchange, but the direct cause of stomatal opening is accumulation (influx) of K+ ions in guard cells.
Step 4: Evaluation of options.
Efflux of K+ causes closure, while H+ and Fe+ are not primary regulators of stomatal movement.
Step 5: Physiological consequence.
K+ influx increases osmotic potential, drawing water into guard cells and opening the pore.
Step 6: Final conclusion.
Thus, stomata open due to influx of K+ ions.
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