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This document discusses the transport of water in plants. It describes how water is absorbed through roots and moves upward through the stem and branches to the leaves, where most is lost to transpiration. Three theories are presented for the ascent of sap: 1) Vital force theory, which suggests living cells actively transport water; 2) Root pressure theory, where pressure in roots pushes water up small plants; and 3) Physical force theory, where surface tension, cell wall absorption, or transpiration pull (

Author

vijend

Language

EN