the basis of stomatal opening is
a exoosmosis
b decreased cell sap concenteration
​c pottasium efflux
d increased turgor
 

Dear student, 
Please find below the solution to the asked query        

The opening  and closing of stomata is dependent on the turgidity of the guard cells. Active excretion of hydrogen ions from the guard cells facilitates the movement of K+ into the guard cells . This allows uptake of water by osmosis thus making guard cells turgid and the stoma opens. 
Increased turgidity is responsible for opening of stomata. Hence, option (d) is correct.​

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