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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Question
Chapter 34.2, Problem 4R
Summary Introduction
To review:
The evidence that supports the transpiration-cohesion-tension mechanism for the transport of water through the xylem.
Introduction:
The movement of water through the plant occurs through the xylem. It consists of dead cell elements—tracheid and vessels. They are fused end to end so as to form long tubes of xylem throughout the plant. The main function of xylem is to conduct and transport water and other minerals from the roots to the shoots.
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Chapter 34 Solutions
Life: The Science of Biology
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- Discuss which pathway permits the passage of most solutes and water inside the roots? Which pathway allows the entry of most of the water and some of the solutes inside the root tissue? Explain how the Casparian strip creates a barrier for substance moving through this pathway and how it is circumvented.arrow_forwardIn what conditions apoplastic transfer of phloem unloading will be necessary and why? *arrow_forwardBriefly explain the transpiration-cohesion-tension mechanism in plantarrow_forward
- Describe how roots absorb positively charged mineral ions by the process of cation exchange.arrow_forwardwhy is pressure higher in parts of the phloem Where sugar is being loaded than in parts were sugars been removed?arrow_forwardBoth 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?arrow_forward
- Consider the pressure flow model of phloem transport. How do sugars and water enter the phloem from the source? How do sugars and water move from one phloem cell to another?arrow_forwardHow do air bubbles form in the xylem and how are they eliminated to have a smooth transport of water in xylem?arrow_forwardWhat is the mechanism behind vascular water transport and why does it happen in dead xylem cells?arrow_forward
- Describe the relationship between transpiration rate and light intensity in basil Ocimum basilicum in terms of photosynthesis, optimal range, and stomata.arrow_forwardDescribe the relationship between transpiration rate and light intensity in basil Ocimum basilicum.arrow_forwardWhich of the following is a mechanism of water movement in xylem that combines the evaporative pull of transpiration with the cohesive and adhesive properties of water? (a) pressure– flow (b) tension–cohesion (c) root pressure (d) active transport of potassium ions into guard cells (e) guttationarrow_forward
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