These theories state that the vital capacity of the living cells is responsible for the ascent of sap. Here, we review the recent literature on this topic with the aim of highlighting how a multi-disciplinary perspective has contributed to our understanding of the cohesion-tension theory of sap ascent in plants. 9. Godlewski proposed relay pump theory to explain ascent of sap. 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Various theories have been put forth to explain the mechanism of translocation of water. The theory was well, University of Cape Coast,Ghana • MANAGEMENT BUS 406, Sociology A Down To Earth Approach Chap 11-22, University of Cape Coast,Ghana • BUS 406, University of Cape Coast,Ghana • SOC 201, University of Cape Coast,Ghana • LITERATURE 10. i. This classical explanation of the sap ascent phenomenon in tall trees is known as the cohesion-tension theory (Dixon and Joly (1894)) and is followed by a quantitative analysis of the sap motion proposed by van der Honert (1948). iii. (2) The movement is against the gravity and describecd as ascent ot sap. ye video important hai CSIR aur neet ke liye isme apko incompatibility ke baare me poori jaankari milegi low to high level tak akhiri tak dekhiye pasand aye subscribe aur like kariye thankyou. Sir J.C. Bose (1923) proposed a vital theory for the ascent of sap. According to the vital force theory, the conduction of water up the xylem vessel is a result of vital action of the living cells in the xylem tissue.. Jagadish Chandra Bose suggested a mechanism for the ascent of sap in 1927. This is followed by an increase in water potential of the living cells and hence the absorbed water is pumped into the vessel element situated above and the process is repeated again and again, thus resembling a kind of staircase movement of water in the xylem. The transport system that drives sap ascent from soil to leaves is extraordinary and controversial. 3. According to this theory, the activity of living cells of the root is responsible for the translocation of water. Vital Theories: Such theories had been given very early and contain only historical significance. Vital Theories . This is followed by an increase in water potential of the living cells and hence the absorbed, water is pumped into the vessel element situated above and the process is repeated again and, again, thus resembling a kind of staircase movement of water in the xylem. iii. According to him there was a rhythmic change in the osmotic pressure of the living cells of xylem parenchyma and medullary rays, which brought about a pumping action of water in an upward direction. explaining the ascent of sap have been proposed over the years (Askenasy 1895; Zimmermann & Brown 1980). Definition: The upward movement of water and mineral salts in xylem vessels through the roots to aerial parts of the plants is known as ascent of sap. The theories are, Vital-Force Theory, Root-Pressure Theory and Physical-Force, With a decrease in water potential of these living cells water diffuses into them from the adjacent. 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