Life: The Science of Biology
Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 34.2, Problem 1R
Summary Introduction

To review:

The experiment that ruled out the role of pressure in the upward movement of water through the xylem.

Introduction:

Plants have specialized transport tissue for the absorption of water, minerals, and ions from the soil. These are called the xylem that functions to conduct water and minerals from roots to the shoots and leaves. Xylem consists of tracheid and vessels, which are arranged one on the other to form long tubes.

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Both cohesion-tension and root pressure are mechanisms for moving water in the xylem.  What does it mean when it says that cohesion-tension pulls water, but root pressure pushes water?
why is pressure higher in parts of the phloem Where sugar is being loaded than in parts were sugars been removed?
To transport water from the root into the shoot does the water potential in the xylem need to become more positive or negative? Why?
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