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

Question

In a dicot stem undergoing secondary growth, which of the following is the FIRST to differentiate from the cells produced by the vascular cambium towards the pith?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Secondary growth in dicot stems
 **Related Topics**: Vascular cambium, xylem, phloem, periderm
 **Prerequisites**: Understanding of plant tissue types and their functions, knowledge of secondary growth.
## SOLUTION PATHWAY
**Given Information**:
  Dicot stem undergoing secondary growth.
  Question asks about the first cell type to differentiate from vascular cambium towards the pith.
**Method & Steps**:
 1. Identify the location of the vascular cambium in a dicot stem.  The vascular cambium is a meristematic tissue located between the xylem and phloem.
  Reasoning: The vascular cambium is responsible for producing secondary xylem (towards the inside, towards the pith) and secondary phloem (towards the outside).
  Formula/Rule: None
 2. Understand the direction of cell differentiation from the vascular cambium. Cells produced by the vascular cambium differentiate into secondary xylem towards the pith (center) and secondary phloem towards the cortex (outside).
  Working: The cells produced inward differentiate into secondary xylem. The cells produced outward differentiate into secondary phloem.
  Key Point: The order of differentiation is crucial here.
 3. Determine which tissue differentiates first.  Secondary xylem differentiates first towards the pith.
  Result: Secondary xylem is the first tissue to differentiate from the vascular cambium towards the pith.
  Verification: This aligns with the typical pattern of secondary growth in dicots.
 ## OPTION ANALYSIS
A] ✓: Secondary xylem is correctly identified as the first tissue to differentiate towards the pith from the vascular cambium.
B] :x: Secondary phloem differentiates towards the cortex, not the pith.
C] :x: Phelloderm is part of the periderm, which is formed by the cork cambium, not the vascular cambium.
D] :x: Phellem (cork) is also part of the periderm, formed by the cork cambium, not the vascular cambium.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the direction of secondary xylem and phloem differentiation: Remember that secondary xylem is formed towards the pith and secondary phloem towards the cortex.
  2.Confusing the roles of vascular cambium and cork cambium: The vascular cambium produces secondary xylem and phloem; the cork cambium produces periderm (phelloderm, phellem).
 **Quick Tips**:
  1.Visualize the cross-section of a dicot stem undergoing secondary growth to understand the arrangement of tissues and the direction of cell differentiation.
  2.Remember the acronym 'PX' to help remember that the cells produced by the vascular cambium differentiate as Phloem (towards the outside) and Xylem (towards the inside/pith).

Mr. NARESH KUMAR K · Answer

The correct Option is "Secondary xylem"

Mr. NARESH KUMAR K · Answer

Secondary phloem

Mr. NARESH KUMAR K · Answer

Phelloderm

Mr. NARESH KUMAR K · Answer

Phellem

NEET Botany Anatomy of Flowering Plants Dicot Stem MCQs

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