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

1. Tensile strength of water
2. Lignification of xylem vessels
3. Positive root pressure
4. Dissolved sugars in water

Correct answer: Tensile strength of water

Solution

Tall trees maintain an unbroken water column because water has high tensile strength, allowing it to withstand the negative pressure created during transpiration. This cohesion prevents the column from snapping under its own weight.

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