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21)Mention physical properties of water which help inascent of xylem sap.22) What are nroteins? Name any two amino acids

Answer»

The transpiration drivenascentof xylemsapdepends mainly on the following physical properties of water(i) Cohesion Mutual attraction betweenwatermolecules. (ii) Adhesion Attraction ofwatermolecules to polar surfaces (such as the surface of tracheary elements).



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