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NEET 2016
Exam
NEET
Year
2016
Subject
Botany
Chapter
Transport in Plants

NEET 2016 · Botany · Transport in Plants

A few drops of sap were collected by cutting across a plant stem by...

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 indicate that it is phloem sap?

Options

  1. AAcidic
  2. BAlkaline
  3. CLow refractive index
  4. DAbsence of sugar

Correct answer

B. Alkaline

Step-by-step solution

Chemical analysis of sieve tube sap proves that concentrated solution of sucrose is translocated from the place of synthesis to other parts of the plant body. Glucose and fructose are sometimes found in traces only. The amount of sucrose is more in phloem sap during the day and less in night. In xylem the amount of sucrose is in traces and also there is no diurnal fluctuation. Alkaline pH (7.8 - 8.0) is present in phloem sap whereas xylem sap is acidic.
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