A) dissolved sugars in water
B) tensile strength of water
C) lignification of xylem vessels
D) positive root pressure
Correct Answer: B
Solution :
A column of water within xylem vessels of tall trees does not break under its weight because of high tensile strength of water, i.e. an ability to resist a pulling force. This high tensile property depends on cohesion, adhesion and surface tension property of water. Due to these forces only transpiration driven ascent of xylem sap occurs.
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