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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?

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Acidic

Alkaline

Low refractive index

Absence of sugar

answer is B.

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Detailed Solution

pH of phloem sap is slightly alkaline. It is 7.3 to 8.5.
(1) Phloem sap is not acidic. Xylem sap is acidic.
(3) Phloem sap has high refractive index. Xylem sap has low refractive index.
(4) Phloem sap has sugars and mainly sucrose.

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