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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

Audiences:

Undergraduate

Topics:

Bulk Flow,  Flux,  Physiology,  Plant physiology,  Biology

Special Instructions

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Background Information

Associated Publications

What a Difference in Pressure Makes! A Framework Describing Undergraduate Students’ Reasoning about Bulk Flow Down Pressure Gradients

Jennifer Doherty, Emily Scott, Jack Cerchiara, Lauren Jescovitch, Jenny McFarland, Kevin Haudek, Mary Wenderoth, 2023

Question Instructions

We recommend that you administer these questions as homework and preface the question with these instructions for students:

"For the following question, please respond to the best of your knowledge and using only the information in the question and what you know. Please do not refer to any outside sources (textbooks, notes, internet, etc.). Any reasonable attempt to answer the question will be awarded full credit."

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