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Q.

Stomata open when

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a

CO2 concentration in guard cells is high

b

pH of guard cells is high

c

guard cells loose K+ ions

d

accumulated malate is consumed in guard cells

answer is B.

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Detailed Solution

Accumulation of K+ ions into guard cells from the subsidiary cells in the presence of light. This coupled with efflux of protons leads to increase in pH of the guard cells . It leads to endosmosis , guard cells become turgid and stomata gets opened.

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