Q.

Stomata open when guard cells swell due to

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a

Endosmosis by influx of hydrogen ions

b

Decreased water potential

c

Endosmosis by efflux of K+ ions

d

Increased water potential 

answer is A.

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Detailed Solution

Influx of K+ and Cl- ions into the guard cells water potential is decreased so water move from high water potential to low water potential so water enter in to guard cell stomata is open

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