What are two forces responsible for the upward movement of water in xylem tissue?
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Ascent of sap is the phenomena responsible for pullup of water.There are two theories regarding the ascent of SAP one is transpiration pull theory in which due to the continuous loss of water in the process of transpiration the water keeps to come up another one is fruitful theory in which due to the Osmosis of water and Minerals ions in the root hairs tends to the water to come up with the force but that is not reliable for the Big trees and Big trees such as of hundred metres to transportation full theory is liable to everyone universally