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NEET2003BotanyPhotosynthesis in Higher PlantsActual

Stomata of a plant open due to:

Options

  1. Ainflux of potassium ions
  2. Befflux of potassium ions
  3. Cinflux of hydrogen ions
  4. Dinflux of calcium ions

Correct answer

A. influx of potassium ions

Step-by-step solution

The opening of the stomata is related to the influx of the K ⁺ ions into the guard cells. The K ⁺ ions are obtained from the nearby subsidiary and epidermal cells. Due to this influx, the concentration of the K ⁺ ions in the guard cells. The presence of high energy ATP molecules triggers the entry of K ⁺ ions into the guard cells. Further, the presence of ATP also triggers the H ⁺ uptake by guard cell chloroplasts or mitochondria.

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