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

Question

What is the arrangement of protoxylem and metaxylem in the vascular bundles of a monocot stem?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Arrangement of xylem in vascular bundles
 **Related Topics**: Monocot anatomy, vascular bundles, protoxylem, metaxylem
 **Prerequisites**: Basic understanding of plant anatomy and vascular tissue.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the arrangement of protoxylem and metaxylem in monocot stems.
  Monocot stems have scattered vascular bundles.
**Method & Steps**:
 1. Understand the terms:
  Reasoning: Protoxylem is the first formed xylem, while metaxylem is the later formed xylem.
  Exarch: Protoxylem is towards the periphery and metaxylem towards the center.
  Endarch: Protoxylem is towards the center and metaxylem towards the periphery.
  Mesarch: Protoxylem is in the middle.
  Centrifugal: Development proceeds outwards from the center.
 2. Recall the arrangement in monocot stems:
  Working: In monocot stems, the vascular bundles are arranged in a scattered pattern.  The protoxylem is located towards the center of the vascular bundle, and the metaxylem is towards the outside.
  Key Point: This arrangement is characteristic of monocot stems.
 3. Identify the correct arrangement:
  Result: The arrangement described is endarch.
  Verification:  Refer to standard botanical texts and diagrams of monocot stem anatomy.
 ## OPTION ANALYSIS
[A] :x: Exarch arrangement is found in roots, not monocot stems.
[B] ✓: Endarch arrangement is the correct description for the arrangement of protoxylem and metaxylem in monocot stems.
[C] :x: Mesarch is not the typical arrangement in monocot stems.
[D] :x: Centrifugal describes the direction of development, but not the final arrangement relative to the center of the vascular bundle.  In monocots, the arrangement is endarch, not simply centrifugal.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the arrangement in monocot stems with that in dicot stems or roots: Dicot stems have a ring of vascular bundles, and roots typically show exarch xylem.  Monocot stems are unique in their scattered vascular bundles with endarch xylem.
  2.Misunderstanding the terms exarch, endarch, mesarch:  Clearly define each term and associate them with their respective locations of protoxylem and metaxylem.
 **Quick Tips**:
  1.Remember that monocot stems have scattered vascular bundles with endarch xylem.
  2.Create a diagram to visualize the arrangement of protoxylem and metaxylem in a monocot stem vascular bundle.

Mr. NARESH KUMAR K · Answer

Exarch

Mr. NARESH KUMAR K · Answer

The correct Option is "Endarch"

Mr. NARESH KUMAR K · Answer

Mesarch

Mr. NARESH KUMAR K · Answer

Centrifugal

NEET Botany Anatomy of Flowering Plants Monocot Stem MCQs

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