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Question
According to starch sugar inter conversion theory of stomatal opening, stomatal opening is preceded by
According to starch sugar inter conversion theory of stomatal opening, stomatal opening is preceded by
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Solution
The correct option is C increase in pH of guard cell
According to starch sugar inter conversion theory of stomatal opening, stomatal opening is regulated by the pH of the guard cells. Stomata opens in neutral or alkaline pH. Guard cells contain sugar during day time when they are open and starch during night when they are closed. During daytime, CO2 released in respiration is used in photosynthesis which makes the medium of guard cell alkaline (high pH). The starch produced in night is converted into sugar in daytime in the presence of enzyme phosphorylase. Sugar is soluble in water and consequently there is increased in the concentration of solute in the guard cells. So, the cells become turgid due to entry of water. The thin outer wall of guard cell stretches outward and open the stomata.
According to starch sugar inter conversion theory of stomatal opening, stomatal opening is regulated by the pH of the guard cells. Stomata opens in neutral or alkaline pH. Guard cells contain sugar during day time when they are open and starch during night when they are closed. During daytime, CO2 released in respiration is used in photosynthesis which makes the medium of guard cell alkaline (high pH). The starch produced in night is converted into sugar in daytime in the presence of enzyme phosphorylase. Sugar is soluble in water and consequently there is increased in the concentration of solute in the guard cells. So, the cells become turgid due to entry of water. The thin outer wall of guard cell stretches outward and open the stomata.