Question:
Casparian strips in the root endodermis are made of:
Casparian strips in the root endodermis are made of:
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Suberin acts like "waterproof wax" in roots to ensure the plant can filter what enters its "veins."
Updated On: May 5, 2026
- Cellulose
- Pectin
- Suberin
- Lignin
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The Correct Option is C
Solution and Explanation
Step 1: Concept
The endodermis is the innermost layer of the root cortex, acting as a biological checkpoint for water and minerals entering the vascular cylinder.
Step 2: Meaning
Casparian strips are specialized hydrophobic wall bands found in the radial and transverse walls of endodermal cells.
Step 3: Analysis
These strips are primarily composed of suberin, a waxy, water-impermeable substance. This prevents water from moving through the apoplastic pathway (cell walls) and forces it to enter the symplast (cell cytoplasm) to reach the xylem.
Step 4: Conclusion
Based on the chemical composition of these waterproof barriers, suberin is the primary constituent. Final Answer: (C)
The endodermis is the innermost layer of the root cortex, acting as a biological checkpoint for water and minerals entering the vascular cylinder.
Step 2: Meaning
Casparian strips are specialized hydrophobic wall bands found in the radial and transverse walls of endodermal cells.
Step 3: Analysis
These strips are primarily composed of suberin, a waxy, water-impermeable substance. This prevents water from moving through the apoplastic pathway (cell walls) and forces it to enter the symplast (cell cytoplasm) to reach the xylem.
Step 4: Conclusion
Based on the chemical composition of these waterproof barriers, suberin is the primary constituent. Final Answer: (C)
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