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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 trees, 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?

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 trees, 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?

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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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 trees, 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: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 trees, 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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