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.