Describe the theories related to the translocation of water.

Solution

Theories of translocation of water : There are following theories concerned with translocation of water.

(i) Root pressure theory - Proposed by Priestley. States that living cells of the root is responsible for water translocation.
(ii) Capillary force theory - Proposed by Boehm. States that physical forces and dead cells are responsible for the ascent of sap.
(iii) Cohesion force theory - Proposed by Dixon and Jolly. Most widely accepted theory based on cohesion and adhesion of water and transpiration pull.

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