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?
Acidic
Alkaline
Low refractive index
Absence of sugar
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