Stomata of a plant opens due to
Correct answer: A. Influx of potassium ions
- A. Influx of potassium ions
- B. Efflux of potassium ions
- C. Influx of hydrogen ions
- D. Influx of calcium ions
Explanation
The correct answer is the influx of potassium ions into the guard cells of the stomata. When light is available, potassium ions are actively transported into these cells, leading to an increase in turgor pressure. This pressure causes the guard cells to swell and bend, resulting in the opening of the stomata for gas exchange. The other options are incorrect: the efflux of potassium ions would decrease turgor pressure and close the stomata, while the influx of hydrogen or calcium ions does not directly cause the stomatal opening mechanism.
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About Forms and Functions of Plants
Plant nutrition and transport cover mineral uptake, photosynthesis, xylem movement of water and minerals, and phloem translocation of sugars. Plant growth regulators include auxins, gibberellins, cytokinins, abscisic acid and ethene, whose effects on cell division, elongation, dormancy, fruit ripening and tropic responses should not be confused with mineral nutrition.
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