The trunk of a tree shrinks in the day due to

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(B) During the day,the rate of transpiration is high due to sunlight and temperature.Transpiration creates a negative pressure or tension in the xylem

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Transpiration induced tension

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(B) During the day,the rate of transpiration is high due to sunlight and temperature.Transpiration creates a negative pressure or tension in the xylem vessels,known as transpiration pull.This tension causes the xylem vessels to contract slightly,which leads to a measurable shrinkage in the diameter of the tree trunk during the day.

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