What will be the effect of accumulation of ions in guard cells?
a)	Water potential increases	b)	Water potential decreases
c)	Loss of turgidity	d)	Exosmosis

(b)

ions regulate the opening and closing of stomata. Increased concentration  and malate ions in the guard cells increases the OP of guard cells, which results in decrease of water potential. Due to which water enters from adjoining subsidiary cells into guard cells by endosmosis. Turgor pressure of guard cells increases, which results in the opening of stomata.