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Which one of the following statements is not correct for the Casparian strip?
It breaks the continuity of water movement through the apoplast pathway.
It is formed in the growing part of the root.
It is formed several millimetres or several centimetres behind the root tip.
It is a band within the radial cell walls of the endodermis that is impregnated with lignin.
Answers (1)
The Casparian strip is not formed in the growing part of the root. It is a specialized region in the mature region of the root, specifically in the endodermal cells. The Casparian strip is a band of suberin and lignin impregnated in the radial cell walls of the endodermis, which surrounds the vascular tissue. Its main function is to create a waterproof barrier that blocks the movement of water and solutes through the apoplast pathway. The Casparian strip forces water and solutes to pass through the selectively permeable plasma membranes of the endodermal cells, allowing for regulation and control of nutrient uptake and transport in plants. Hence, the correct answer is option 2.
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