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The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of [2008]
  • a)
    lignified thick walls
  • b)
    cohesion and adhesion
  • c)
    weak gravitational pull
  • d)
    transpiration pull 
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The rupture and fractionation do not usually occur in the water column...
The rupture and fractionation do not usually occur in the water column in vessel/ tracheids during the ascent of sap because of cohesion and tension. The water molecules have a great mutual attraction with each other or in other words we can say that they have tremendous cohesive power which is sometimes as much as 350  atmospheres. Thus, the transpiration pull develops a negative pressure in the uppermost xylem cells. It is transmitted from there into the xylem of stems, and from there into the xylem of stems, and from there to the roots. 
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The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of [2008]a)lignified thick wallsb)cohesion and adhesionc)weak gravitational pulld)transpiration pullCorrect answer is option 'B'. Can you explain this answer?
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