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According to Pressure-Flow Theory,how Does Sap Move from the Sieve

Question 68

Multiple Choice

According to pressure-flow theory,how does sap move from the sieve tube into a sink?


A) osmosis of the dissolved sugars across the sieve tube and the sink plasma membranes
B) a positive pump pressure
C) gravitational action as phloem moves down from the source
D) active membrane transport through the plasma membranes
E) a negative pump pressure

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