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Answer: (b) 10-20 meters

Root pressure is the positive hydrostatic pressure developed in the xylem of roots by active absorption of minerals and osmotic entry of water. Its usual value is about +1 to +2 bars. A pressure of about 1 bar can support a column of water roughly 10 m high, so +1 to +2 bars can push water up only about 10–20 m. This is not enough to explain the ascent of sap in tall trees, which is mainly due to the transpiration pull.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report
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