Correct Answer is : Guard cells swell due to an increase in their water potential.

Guard cells swell by endosmosis due to influx of hydrogen ions (protons)

Guard cells swell by endosmosis due to efflux of potassium ions.

Guard cells swell due to a decrease in their water potential.

Guard cells swell due to an increase in their water potential.

KCET 2009 Biology Solved Paper

Question : 38 of 60

Marks: +1, -0

Stoma opens when

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