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2. Several experiments have been performed to test the cohesion-tension theory as to how water moves through a plants xylem tissue. One such experiment measured minute diameter changes in the trunk on a daily basis. What changes in trunk diameter might you predict this experiment would show over a 24-hour period? Would the diameter changes be equal throughout the plant? Explain.

2. Several experiments have been performed to test the cohesion-tension theory as to how water moves through a plants xylem tissue. One such experiment measured minute diameter changes in the trunk on a daily basis. What changes in trunk diameter might you predict this experiment would show over a 24-hour period? Would the diameter changes be equal throughout the plant? Explain.

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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2. Several experiments have been performed to test the cohesion-tension theory as to how water moves through a plants xylem tissue. One such experiment measured minute diameter changes in the trunk on a daily basis. What changes in trunk diameter might you predict this experiment would show over a 24-hour period? Would the diameter changes be equal throughout the plant? Explain. 3. Some plants transport sugar to companion cells using the symplastic pathway through plasmodesmata (passive loaders). In other plants, the companion cells lack plasmodesmata and sugars must be imported by using H+-Sucrose-cotransporters (active loaders). What are the tradeoffs for both active and passive loaders? 4. Maple syrup is harvested from many species of maple tres, Acer sp, but in order to tap into the syrup, one must drill 2 to 2.5 inches into the tree trunk. Furthermore, the syrup can only be collected after a time of hard freeze, followed by several sunny days with temperatures in the 40s, early in the spring. Based on this description, what part of the tree is specifically being tapped and why it can only be tapped under these conditions?
Transcribed Image Text:2. Several experiments have been performed to test the cohesion-tension theory as to how water moves through a plants xylem tissue. One such experiment measured minute diameter changes in the trunk on a daily basis. What changes in trunk diameter might you predict this experiment would show over a 24-hour period? Would the diameter changes be equal throughout the plant? Explain. 3. Some plants transport sugar to companion cells using the symplastic pathway through plasmodesmata (passive loaders). In other plants, the companion cells lack plasmodesmata and sugars must be imported by using H+-Sucrose-cotransporters (active loaders). What are the tradeoffs for both active and passive loaders? 4. Maple syrup is harvested from many species of maple tres, Acer sp, but in order to tap into the syrup, one must drill 2 to 2.5 inches into the tree trunk. Furthermore, the syrup can only be collected after a time of hard freeze, followed by several sunny days with temperatures in the 40s, early in the spring. Based on this description, what part of the tree is specifically being tapped and why it can only be tapped under these conditions?
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