15. All the following involves osmosis except
(a) Water from soil entering a root hair
(b) Water passing from root hair to adjacent cells
(c) Water passing up a xylem vessel element to xylem vessel element above it
(d) Water entering a mesophyll cell from xylem vessel element
Ans. (c) In xylem vessels water rises due to the transpiration pull and the cohesive power of water molecules.
(68)
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