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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: Lignification of xylem vessels

Solution

Lignification is the process of depositing lignin, a complex organic compound, into the cell walls of xylem vessels. This makes the vessels rigid and prevents them from collapsing under the weight of the water column.

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