Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 34, Problem 5TYK
Summary Introduction
Introduction:
The entering of water and dissolved solutes into the root takes place through root epidermis. The mechanisms used are symplast and majorly the apoplast. In the apoplastic mechanism, water usually moves through the nonliving regions, while in the symplast, water passes into and through the living cells. In apoplastic, water moves inward till endodermis. Endodermal cells are tightly pack and have lignified casparian belt.
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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.
(b) Water absorbed by plant roots travels by different pathways from the root hairs to the xylem.
Figure 5 shows these pathways in a plant root.
cell A
xylem vessel
root hair
key
pathway B
Tissue D
Tissue E
* pathway C
Figure 5: Schematic representation of water movement through the tissues of a plant root
(PLEASE TURN OVER)
Page 6
CONT'D from Page 5
i. Explain how water moves from the root hair to the xylem vessels in the root.
ii. Identify cellA, pathway B, pathway C, tissue D and tissue E in Figure 5.
Figure 2 shows the cross-section of a eudicot root.
i. Based on Figure 2, identify the structure that regulates the movement of water and minerals towards the xylem in the root.
ii. Name structure of the cell membrane allows it to act as a selective barrier?
iii. Predict what will happen to the transportation of water and minerals through the plasma membrane if the root was poisoned and no cellular respiration occurred
Chapter 34 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 34.1 - Prob. 1SBCh. 34.1 - Prob. 2SBCh. 34.1 - Explain how the apoplastic, symplastic, and...Ch. 34.2 - Prob. 1SBCh. 34.2 - Prob. 2SBCh. 34.3 - Prob. 1SBCh. 34.3 - Prob. 2SBCh. 34.3 - Prob. 3SBCh. 34.4 - Prob. 1SBCh. 34.4 - Prob. 2SB
Ch. 34.5 - Compare and contrast translocation and...Ch. 34.5 - Prob. 2SBCh. 34 - Prob. 1TYKCh. 34 - Prob. 2TYKCh. 34 - Prob. 3TYKCh. 34 - Prob. 4TYKCh. 34 - Prob. 5TYKCh. 34 - Prob. 6TYKCh. 34 - Prob. 7TYKCh. 34 - Prob. 8TYKCh. 34 - An indoor gardener leaving for vacation completely...Ch. 34 - Prob. 10TYKCh. 34 - Prob. 11TYKCh. 34 - Prob. 12TYKCh. 34 - Discuss Concepts Concerns about global climate...Ch. 34 - Prob. 14TYKCh. 34 - Apply Evolutionary Thinking A variety of...Ch. 34 - Prob. 1ITDCh. 34 - Prob. 2ITDCh. 34 - Prob. 3ITD
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