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The force responsible for raising water in \( 100 \mathrm{ft} \) tall plant is

1. Transpiration pull
2. Root pressure
3. Air pressure
4. Capillary action

Correct answer: Transpiration pull

Solution

Transpiration from the leaves creates negative pressure (tension) in the xylem, pulling water upward over great heights. Root pressure and capillary action are too weak to raise water to about 100 ft.

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