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

  1. A
    Absence of sugar
  2. B
    Acidic
  3. C
    Alkaline
  4. D
    Low refractive index

Solution & Step-by-step Explanation

Phloem sap primarily consists of water and sucrose. It is notably alkaline (pH around 7.5 to 8.5) and has a high concentration of dissolved sugars, which results in a high refractive index. Xylem sap is typically slightly acidic.

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A few drops of sap were collected by cutting across a plant stem. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?
A
Absence of sugar
B
Acidic
C
Alkaline
D
Low refractive index

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Plant PhysiologyTransport in Plants

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