Stoma opens when – McqOptions

MCQOPTIONS

1.	Stoma opens when
A.	Guard cells swell by endosmosis due to efflux of potassium ions.
B.	Guard cells swell by endosmosis due to influx of hydrogen ions (protons)
C.	Guard cells swell due to an increase in their Water potential.
D.	Guard cells swell due to a decrease in their water potential.
Answer» D. Guard cells swell due to a decrease in their water potential.

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