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Question #46799
The Question
A researcher treats a living dicot root with an amphipathic surfactant that specifically dissolves suberin. Which of the following will be the most direct physiological consequence of this treatment on root transport mechanisms?
Options
- A.
The apoplastic pathway will extend uninterrupted into the stele, abolishing the selective filtration of mineral ions.
- B.
The symplastic pathway will become the exclusive route for water movement from the epidermis to the xylem.
- C.
Root pressure will significantly increase due to the enhanced permeability of the endodermal plasma membranes.
- D.
The active transport of minerals into the pericycle will be completely halted, stopping all water absorption.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Casparian_Strip_Chemistry|Lipid_Amphipathic_Nature|Endodermis
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize 'endodermis = symplast' without understanding the mechanical reason.
The Casparian strip is a physical roadblock for the apoplast.
Removing the roadblock doesn't force more symplastic transport; it allows unregulated apoplastic flow, destroying selective permeability and mineral homeostasis.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Anatomy of Flowering Plants - Class 11 |
| Concept | Casparian Strip Chemistry |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |