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Stoma opens, when...

Stoma opens, when

A

guard cells swell due to an increase in their water potential

B

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

C

guard cell swell by endosmosis due to efflux of potassium ions

D

guard cells swell due to a decrease in their water potential

Text Solution

Verified by Experts

The correct Answer is:
D
During day time, photosynthesis occurs in guard cells, because they contain chloroplast. The soluble sugar formed by this process decreases the water potential of guard cells, resulting in stomata opening.
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