A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap ?
(1) Acidic (2) Alkaline
(3) Low refractive index (4) Absence of sugar
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Option 2)Alkaline.
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alkaline nature indicates that it is phloem sap.but when it is contaminated with xylem exudates and organic acids it exhibit slightly acidic pH
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