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Plant Water Relation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPlant Water Relation1 Mark
Question
Why do diurnal changes occur in osmotic potential of guard cells?
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Answer

Enzyme activity of phosphorylase converts starch into sugar during daytime and sugar is converted to starch during night. This causes changes in osmotic potential of guard cells.

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