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Stomata of a plant open due to:

1. influx of calcium ions
2. influx of potassium ions
3. efflux of potassium ions
4. influx of hydrogen ions

Correct answer: influx of potassium ions

Solution

Stomata open when guard cells take up potassium ions, which lowers their water potential. Water then enters by osmosis, the guard cells become turgid, and the pore opens.

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