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  • Need clarity, kindly explain! A column of water within xylem vessels of tall trees does not break under its weight because of:

A column of water within xylem vessels of tall trees does not break under its weight because of:

  • Option 1)

    Tensile strength of water

  • Option 2)

    Lignification of xylem vessels

  • Option 3)

    Positive root pressure

  • Option 4)

    Dissolved sugars in water

 

Answers (1)

 

Cohesion tension or transpirational pull theory -

There is a continuous column of water from root through the stem and into leaves. Water molecules are attached with each other by cohesion force, and by walls of tracheary by adhesion force. 

- wherein

Given by Dixon and Jolly (1894).

 

 Tensile strength of water is very high.

 


Option 1)

Tensile strength of water

Correct option

Option 2)

Lignification of xylem vessels

Incorrect option

Option 3)

Positive root pressure

Incorrect option

Option 4)

Dissolved sugars in water

Incorrect option

Posted by

Vakul

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