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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