Phloem Pressure Gradients


Q.

The same kind of sap flows through three very long, phloem vessels. Each vessel has the same diameter but different flow rates of sap. A scientist measures the pressure of the sap near the beginning and near the end of each phloem vessel.

Which phloem vessel has the greatest flow rate (L/hour) of sap?
a) Phloem vessel 1
b) Phloem vessel 2
c) Phloem vessel 3

 

Explain why the phloem vessel you selected has the greatest flow rate (L/hour) of sap.

PLATUBES


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