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

Question

In plants exhibiting unusual secondary growth, like in Bougainvillea, the additional cambia arise from:

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Secondary growth in plants, anomalous secondary growth
 **Related Topics**: Vascular cambium, pericycle, cortex, procambium, xylem parenchyma
 **Prerequisites**: Understanding of plant anatomy, including the arrangement of tissues in stems and roots, and the role of the vascular cambium in secondary growth.
## SOLUTION PATHWAY
**Given Information**:
  Plants exhibiting unusual secondary growth (e.g., Bougainvillea)
  Question asks the origin of additional cambia.
**Method & Steps**:
 1. Understand typical secondary growth:  Typical secondary growth involves the vascular cambium producing secondary xylem (inwards) and secondary phloem (outwards). 
  Reasoning: In Bougainvillea and other plants with anomalous secondary growth, the process deviates from the typical pattern.
 2. Identify the source of additional cambia in anomalous secondary growth:  In Bougainvillea, additional cambia arise from the cells of the cortex or pericycle. These additional cambia produce more secondary vascular tissues, leading to the unusual growth patterns observed.
  Working:  The other options are incorrect because residual procambium is usually depleted after primary growth, pith cells rarely differentiate into cambium, and differentiated xylem parenchyma is specialized for storage, not cambium formation.
 3. Confirm the correct answer: The additional cambia in Bougainvillea originate from the cortex or pericycle. 
  Result: Cells of the cortex or pericycle
  Verification: This is consistent with the observed patterns of anomalous secondary growth in Bougainvillea and similar plants. 
 ## OPTION ANALYSIS
A :x: Residual procambium cells are typically exhausted after primary growth. They are not the source of additional cambia in anomalous secondary growth.
B :x: Pith cells are located in the center of the stem and are generally not involved in the formation of additional cambia.
C ✓: Cells of the cortex or pericycle are known to give rise to additional cambia in plants exhibiting anomalous secondary growth, such as Bougainvillea.
D :x: Differentiated xylem parenchyma cells are specialized for storage and are not involved in the formation of new cambia.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing anomalous secondary growth with typical secondary growth:  Remember that anomalous secondary growth differs in the origin and activity of the cambia.
  2.Incorrectly identifying the tissue layers in the plant stem:  A thorough understanding of plant anatomy is crucial for answering this question correctly.
 **Quick Tips**:
  1.Remember that anomalous secondary growth often involves the formation of multiple cambia.
  2.Focus on the location of the additional cambia in plants with unusual secondary growth patterns.

Mr. NARESH KUMAR K · Answer

Residual procambium cells

Mr. NARESH KUMAR K · Answer

Cells of the pith

Mr. NARESH KUMAR K · Answer

The correct Option is "Cells of the cortex or pericycle"

Mr. NARESH KUMAR K · Answer

Differentiated xylem parenchyma

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