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NTA Abhyas NEET2020BotanyTransport in PlantsPractice

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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