Stomata opens when (A) guard cells swell due to a decrease in their water potential. (B) guard c...

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Stomata opens when
(A) guard cells swell due to a decrease in their water potential.
(B) guard cells swell up dueto an increase in their water potential.
(C) guard cells swell by endosmosis due to efflux of potassium ions.
(D) guard cells swell by endosmosis due to intlux of hydrogen ions (protons).
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