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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Botany
Chapter
Transport in Plants

NTA Abhyas 2020 · Botany · Transport in Plants

The most widely accepted theory of ascent of sap in trees is

The most widely accepted theory of ascent of sap in trees is

Options

  1. ACapillarity
  2. BRole of atmospheric pressure
  3. CPulsating action of living cell
  4. DCohesion-tension-transpiration pull model

Correct answer

D. Cohesion-tension-transpiration pull model

Step-by-step solution

Transpiration pull and cohesion theory was put forward by Dixon and Jolly in 1894. According to this theory, the water rises due to the transpiration pull, continuity of the water column, and the cohesive power of water molecules from the lower part of the roots to the higher peaks of the trees.
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