question_answer

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

A) Influx of \[{{K}^{+}}\] ions into guard cells under the influence of ABA hormone.

B) Conversion of sugar into starch in guard cells

C) Efflux of \[{{K}^{+}}\] ions from guard cells under the influence of ABA hormone.

D) Photosynthetic utilisation of \[C{{O}_{2}}\] in guard cells.