Question

$A$ ______ strip in endodermal cell walls forces water and solutes to move through root cells, not around them. a. cutin b. lignin c. Casparian d. cellulose

Name: Problem 2, Chapter 26: Biology Concepts and Applications
Uploaded: 2021-03-29T15:46:35-08:00
Duration: 1 min 29 s
Channel: Christina Sorrentino
Description: A strip in endodermal cell walls forces water and solutes to move through root cells, not around them. a. cutin b. lignin c. Casparian d. cellulose

   $A$  ______ strip in endodermal cell walls forces water and solutes to move through root cells, not around them.
a. cutin
b. lignin
c. Casparian
d. cellulose

Biology Concepts and Applications

Cecie Starr 6th Edition

Chapter 26, Problem 2

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Solved by Expert Christina Sorrentino

03/29/2021

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$A$ ______ strip in endodermal cell walls forces water and solutes to move through root cells, not around them. a. cutin b. lignin c. Casparian d. cellulose

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Key Concepts

Casparian Strip

The Casparian strip is a band of hydrophobic material, primarily suberin, located in the cell walls of endodermal cells in plant roots. It acts as a barrier to prevent the free movement of water and solutes through the apoplast, ensuring that these substances must cross the selectively permeable plasma membranes of cells. This control is crucial for selective uptake of nutrients and the exclusion of harmful substances as water moves toward the vascular system.

Endodermis

The endodermis is the innermost layer of the root cortex that surrounds the vascular tissue. It plays a key role in regulating the flow of water and nutrients into the plant's vascular system through its specialized cell wall modifications, such as the Casparian strip. This regulation ensures that the plant can control the internal chemical environment, selectively absorbing beneficial compounds while blocking pathogens and toxins.

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