(C) During the day,starch is converted into sugars due to an increase in $pH$. This conversion results in an increase in the concentration of the cell

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Stomata open in daylight because starch is changed to osmotically active substances which increase the turgidity of the guard cells.

(C) During the day,starch is converted into sugars due to an increase in $pH$. This conversion results in an increase in the concentration of the cell sap. Consequently,endosmosis of water into the guard cells occurs,which increases their turgidity and leads to the opening of the stomata.

Class 11 Biology Transport in Plants Transpiration (General) and Stomata

Medium

Which one of the following describes a possible reason for the opening and closing of the guard cells?

A
Stomata open in daylight because photosynthesis occurs in the guard cells producing sugar resulting in higher osmotic pressure.
B
Stomata open in daylight because guard cells have chloroplasts and the epidermal cells do not,and so a differential osmotic pressure arises.
C
Stomata open in daylight because starch is changed to osmotically active substances which increase the turgidity of the guard cells.
D
Stomata close in darkness because the starch produced in daylight by photosynthesis is changed into sugars and translocated from the guard cells.