Q.17. Describe active K ion transport mechanism for opening and closing of stomata. [5]
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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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