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

Question

Which tissue layer is primarily responsible for the radial transport of water and minerals absorbed by the root hairs to the xylem in a dicot root, but is LESS prominent in the dicot leaf vascular bundles?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant Anatomy and Water Transport
 **Related Topics**: Dicot root structure, Dicot leaf structure, Apoplast pathway, Symplast pathway, Casparian strip
 **Prerequisites**: Understanding of plant tissue types and their functions.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the tissue layer responsible for radial transport of water and minerals from root hairs to the xylem in a dicot root, and its prominence in dicot leaf vascular bundles.
  We need to compare the prominence of the tissue layer in roots vs leaves.
**Method & Steps**:
 1. Identify the tissue responsible for radial transport in the root.
  Reasoning: Water and minerals absorbed by root hairs move through the cortex to reach the xylem.  The endodermis, with its Casparian strip, regulates this radial movement by forcing water into the symplast pathway.
  Formula/Rule: None directly applicable.
 2. Compare the prominence of this tissue in the root and leaf.
  Working: The endodermis is a prominent layer in the root, forming a distinct boundary around the vascular cylinder. In the leaf, vascular bundles are surrounded by other tissues (mesophyll, etc.), and the endodermis is much less distinct or even absent.
  Key Point: The Casparian strip in the endodermis is crucial for controlling the apoplastic pathway and directing water into the symplast.
 3. Select the correct option.
  Result: The endodermis is the correct answer.
  Verification: Review the function of the endodermis and its structure in roots and leaves.
 ## OPTION ANALYSIS
[A] :x: Pericycle: The pericycle is involved in lateral root formation, but it's not the primary tissue responsible for radial water and mineral transport.
[B] ✓: Endodermis: The endodermis, with its Casparian strip, regulates radial water and mineral movement in the root, directing it into the symplast. It's less prominent in leaves.
[C] :x: Cortex: The cortex facilitates water and mineral movement, but the endodermis regulates it.
[D] :x: Epidermis: The epidermis is the outermost layer; it absorbs water but doesn't directly control radial transport to the xylem.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the roles of the cortex and endodermis: The cortex provides a pathway, but the endodermis controls the pathway and regulates water movement.
  2.Overlooking the significance of the Casparian strip: The Casparian strip is key to understanding the endodermis's role in radial transport.
 **Quick Tips**:
  1.Remember the Casparian strip's location and function.
  2.Visualize the cross-section of a dicot root and compare it to a dicot leaf's vascular bundle.

Mr. NARESH KUMAR K · Answer

Pericycle

Mr. NARESH KUMAR K · Answer

The correct Option is "Endodermis"

Mr. NARESH KUMAR K · Answer

Cortex

Mr. NARESH KUMAR K · Answer

Epidermis

NEET Botany Anatomy of Flowering Plants Dicot Leaf MCQs

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