A) Efflux of \[{{K}^{+}}\]ions from guard cells under the influence of ABA hormone
B) Photosynthetic utilization of \[C{{O}_{2}}\]in guard cells
C) Influx of \[{{K}^{+}}\]ions into guard cells under the influence of ABA hormone
D) Conversion of sugar into starch in guard cells
Correct Answer: B
Solution :
According to Stewards starch-sugar Inter conversion theory, as a result of photosynthesis,\[C{{O}_{2}}\]concentration in guard cells decreases which leads to increase pH in them during day light. This favours hydrolysis of starch (insoluble) into glucose-1- phosphate (soluble) so that osmotic potential becomes lower in guard cells. As a result of this water enters into the guard cells by osmotic diffusion from the surrounding epidermal and mesophyll cells. Guard cells become turgid and stomata open.You need to login to perform this action.
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