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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 ?
A. Acidic
B. Alkaline
C. Low refractive index
D. Absence of sugar

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Correct Answer - B
The sap of phloem is alkaline (pH 8.0 to 8.4 ), while the sap of xylem is acidic (pH 5.2 to 6.5).

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