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Q61. A few of sap were collected by cutting across a plant stem by a suitable method. The sap was chemically. Which one of the following test results indicates that it is phloem sap

  (1) Low refractive index                (2) Absence of sugar                   (3) Acidic               (4) Alkaline    

Dear student,
Answer 61. 4) Alkaline.
Alkaline nature of the phloem sap is due to the proton pumping from companion cell to the outer cell.

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