KCET 2010 Biology Solved Paper

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Question : 7 of 60

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According to Steward's starch hydrolysis theory, which one of the following is the principal reason for the opening of stomata during daytime?

Conversion of sugar into starch in guard cells.
Influx of K+ions into guard cells under the influence of ABA hormone.
Photosynthetic utilization of CO2 in guard cells.
Efflux of K+ions from guard cells under the influence of ABA hormone.

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