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ICSE Class 10 Answered

Explain the mechanism of opening and closing stoma by Potassium ion concentration theory 

Asked by gopimarakani | 20 May, 2020, 02:32: PM
Expert Answer
K+Ion Concentration Theory:
  • It is a recent theory. According to this theory, the stomatal opening and closing depends on the generation of a potassium ion gradient.
  • ATP produced in the guard cells during photosynthesis is utilised to pump the potassium ions of the adjacent cells into the guard cells.
  • Increase in K+ion concentration in the guard cells makes them hypertonic, so more water is drawn inside the cells.
  • Thus, the guard cells become turgid, widening the stomatal opening
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