The positive pressure which can be responsible for pushing up water to small heights in the stem is:

Imbibition

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Plasmolysis

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Root pressure

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Transpiration

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Solution

The correct option is C Root pressure
Root pressure is positive pressure.
Transpiration is loss of water in the form of water vapour from the surface of leaves.
Imbibition is absorption of H $_{2}$ O without making any solution.
Plasmolysis is loss of water from plant cell, when placed in hypertonic solution.

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