The Question is from neet-botany anatomy-of-flowering-plants , and it was created by the author Mr. NARESH KUMAR K

Question

In a monocot root, the passage cells of the endodermis are characterized by all of the following EXCEPT:

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant anatomy, specifically the structure and function of the endodermis in monocot roots.
 **Related Topics**: Casparian strip, apoplastic and symplastic pathways, water and mineral transport in plants.
 **Prerequisites**: Understanding of plant cell structures (cell wall, Casparian strip), and the role of the endodermis in regulating water and nutrient movement.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the characteristics of passage cells in the endodermis of a monocot root.
  Options describe various characteristics of these cells.
**Method & Steps**:
 1. Understand the function of passage cells: Passage cells are specialized endodermal cells that allow the apoplastic pathway (movement through cell walls) to continue into the stele (vascular cylinder) for water and mineral transport.  They facilitate the radial movement of water and minerals from the cortex to the vascular tissue.
 2. Analyze each option:
  a. Retention of thin walls with minimal suberin deposition: This is true. Passage cells maintain thin walls, unlike other endodermal cells which have thick, suberized walls (Casparian strip).
  b. Location opposite to the protoxylem points: This is also true. Passage cells are typically located opposite the protoxylem poles.
  c. Facilitation of water and mineral transport to the xylem: This is the main function of passage cells, so it's true.
  d. Thickened Casparian strips on all walls: This is FALSE. The defining characteristic of passage cells is the *lack* of a thickened Casparian strip.  The Casparian strip is a band of suberin that blocks the apoplastic pathway in other endodermal cells. Passage cells lack this blockage to allow for water and mineral transport.
 3. Identify the exception:
  Option D is the only statement that is NOT characteristic of passage cells in a monocot root.
  Result: D
  Verification: The other options correctly describe the characteristics of passage cells.
 ## OPTION ANALYSIS
A ✓: Passage cells retain thin walls to allow for easier water and mineral passage. 
B :x: Passage cells are strategically located opposite protoxylem to efficiently transport water and minerals.
C :x: This is the primary function of passage cells; they facilitate apoplastic transport to the xylem.
D :x: Passage cells are characterized by the *absence* of a thickened Casparian strip on all walls, allowing for continued apoplastic transport.  This is the correct answer.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing passage cells with other endodermal cells: Remember that passage cells are specialized and differ from typical endodermal cells in their wall structure.
  2.Misunderstanding the function of the Casparian strip: The Casparian strip's role is to regulate water and mineral movement, but passage cells are exceptions to this regulation.
 **Quick Tips**:
  1.Think of passage cells as 'shortcuts' for water and minerals to reach the xylem.
  2.Remember that the key difference between passage cells and other endodermal cells is the presence or absence of a thickened Casparian strip.

Mr. NARESH KUMAR K · Answer

Retention of thin walls with minimal suberin deposition

Mr. NARESH KUMAR K · Answer

Location opposite to the protoxylem points

Mr. NARESH KUMAR K · Answer

Facilitation of water and mineral transport to the xylem

Mr. NARESH KUMAR K · Answer

The correct Option is "Thickened Casparian strips on all walls"

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