The Question is from neet-botany anatomy-of-flowering-plants , and it was created by the author B VENKAT

Question

Which tissue in the monocot root is primarily responsible for the radial transport of water and minerals from the cortex to the xylem?

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant anatomy and water transport in roots
 **Related Topics**: Monocot root structure, apoplast and symplast pathways, Casparian strip
 **Prerequisites**: Understanding of plant tissue types and their functions.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about radial transport of water and minerals in a monocot root, specifically from the cortex to the xylem.
  Monocot roots have a characteristic arrangement of tissues.
**Method & Steps**:
 1. Identify the tissues involved in water and mineral transport in the root.
  Reasoning: Water and minerals enter the root through the epidermis and travel through the cortex.  The xylem is responsible for transporting water and minerals upwards in the plant.
 2. Determine the tissue regulating radial movement.
  Working: The endodermis contains the Casparian strip, a band of suberin that prevents apoplastic (cell wall) movement of water and minerals. This forces water and minerals to enter the symplast (cytoplasm) of the endodermal cells, which then selectively transports them into the xylem.
  Key Point: The Casparian strip is crucial for controlling the entry of water and minerals into the xylem, preventing uncontrolled entry and allowing for selective uptake.
 3. Conclude the tissue responsible for the radial transport.
  Result: The endodermis, due to the presence of the Casparian strip, is the primary tissue responsible for regulating and controlling the radial transport of water and minerals from the cortex to the xylem.
  Verification: The other options are incorrect because the epidermis is the outermost layer, the cortex is the tissue through which water and minerals initially travel, and the pericycle is located just inside the endodermis and is involved in lateral root formation.
 ## OPTION ANALYSIS
A :x: Epidermis is the outermost layer and is primarily involved in protection and absorption, but not the primary regulator of radial transport to the xylem.
B :x: The cortex facilitates the passage of water and minerals, but the control of transport to the xylem is primarily the endodermis's role.
C ✓: Endodermis with its Casparian strip is the key regulator of radial transport, forcing water and minerals to pass through the symplast before reaching the xylem.
D :x: The pericycle is involved in lateral root development, not the primary radial transport to the xylem.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the functions of the cortex and endodermis: Remember the Casparian strip's role in regulating radial transport.
  2.Overlooking the importance of the Casparian strip: This structure is the key to understanding the endodermis's function in this process.
 **Quick Tips**:
  1.Visualize the cross-section of a monocot root and trace the pathway of water and minerals.
  2.Remember “Casparian strip = controlled entry into xylem”

B VENKAT · Answer

Epidermis

B VENKAT · Answer

Cortex

B VENKAT · Answer

The correct Option is "Endodermis"

B VENKAT · Answer

Pericycle

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