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?

  • Option 1)

    Acidic

  • Option 2)

    Alkaline

  • Option 3)

    Low refractive index

  • Option 4)

    Absence of sugar

 

Answers (1)
V Vakul

As discussed in

Bleading -

Exudation of sap or watery solution from the cut or injured parts of the plant.

- wherein

It occurs due to root presure, phloem pressure, local pressure in xylem and latex or resin.

 

 Sap from the injury or cut is due to phloem pressure or local xylem pressure. This results in pumping of protons from companion cells to outside, thus sap becoming alkaline. 

 


Option 1)

Acidic

Incorrect option

Option 2)

Alkaline

Correct option

Option 3)

Low refractive index

Incorrect option

Option 4)

Absence of sugar

Incorrect option

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