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Question

Water column does not rupture during ascent in tracheary elements due to

A
Weak gravitational pull
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B
Transpiration pull
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C
Cohesion and adhesion
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D
None of the above
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Solution

The correct option is B Cohesion and adhesion
Water columns are created when water molecules are adhere (heed) to tracheids or xylem vessels and cohere (associated) to each other, further maintaining the long column of water. Here, the water molecules tend to stick to one another, by strong mutual forces of attraction called cohesion and adhesion forces. That's why water column does not rupture during ascent in tracheary elements even though it translocate water and carries through the xylem vessels to all parts of the plant body.

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