Anatomy of Flowering PlantsHard

Question

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 ?

Options

A.

Acidic

B.

Alkaline

C.

Low refractive index

D.

Absence of sugar

Solution

Alkaline pH (7.8 - 8.0) is present in phloem sap where as xylem sap is acidic.

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