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 3R
Summary Introduction
To review:
The importance of all the three parts of the transpiration-cohesion-tension mechanism in the transfer of water through the xylem.
Introduction:
The water in the xylem of the plants moves primarily by three forces—transpiration, cohesion, and tension. Loss of water from the plant through stomata in form of vapors is known as transpiration. The water in the column of xylem moves because of its cohesion (sticking together of water molecules by hydrogen-bonding) and adhesion (hydrogen-bonding between the water molecules in the sap and the molecules present in the cell walls of xylem) properties.
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Explain the mechanisms that regulate the ion xylem loading.
Explain why xylem transport is unidirectional and phloem transport bi-directional.
If the xylem is under high tension, how will the flow rate in the xylem will be affected?
Chapter 34 Solutions
Life: The Science of Biology
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- Describe the process of development of root nodules in leguminous plant. Name the oxygen scavenger molecule present in root nodules?arrow_forwardBriefly explain the transpiration-cohesion-tension mechanism in plantarrow_forwardName the pressure that helps in the movement of water up the xylem of the root.arrow_forward
- 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_forwardExplain the pressure flow theory of phloem transport.arrow_forwardConsider 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_forward
- Explain why the vascular cambium forms acontinuous sheath that runs from near the tips of thebranches to near the tips of the roots, whereas the corkcambium is discontinuous in both space and time.arrow_forwardDescribe how water and minerals move in xylem. Why is water and mineral movement in xylem unidirectional?arrow_forwardDefine the Cohesion-tension model of xylem transport ?arrow_forward
- What is plant transpiration? What are the two main types of plant transpiration process? Which of them is more significant in volume?arrow_forwardAmong the following combinations, which row is transpiration streams at respective cases? O Up the stem in the Across leaf via apoplast xylem patway mass flow osmosis Up the stem in the xylem osmosis Across leaf vla apoplast patway mass flow Up the stem in the Across leaf via apoplast xylem patway mass flow mass flow Up the stem in the Across leaf via apoplast xylem patway mass flow mass flow Out of leaf via stomata diffusion Out of leaf via stomata osmosis Out of leaf via stomata diffusion Out of leaf via stomata osmosis Into root Across root via symplast cells pathway diffusion osmosis Into root cells diffusion Into root cells osmosis Into root cells osmosis Across root via symplast pathway osmosis Across root via symplast pathway osmosis Across root via symplast pathway osmosisarrow_forwardIf the tension in the xylem vessel becomes too great, gas bubbles will form. Explain this phenomenon countermeasures by plant to address this issue.arrow_forward
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