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

(a) lignification of xylem vessels

(b) positive root pressure

(c) dissolved sugars in water

(d) tensile strength of water.
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Ans: (d) tensile strength of water

Explanation: Water have some cohesion force between itself molecules and also with the wall of xylem vessels. So, in reaching water to the tall trees their column of water does not breaks.

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