The Question is from neet-botany plant-growth-and-development growth, and it was created by the author Mr. NARESH KUMAR K

Question

A researcher observes that the growth rate of a plant significantly increases after the application of a specific hormone.  Further analysis reveals that this hormone promotes cell elongation primarily in the intercalary meristem.  Which hormone is most likely responsible for this observed growth?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant Hormones and Growth
 **Related Topics**: Plant Physiology, Meristematic Tissues, Cell Elongation
 **Prerequisites**: Basic understanding of plant hormones and their functions, knowledge of different types of meristems.
## SOLUTION PATHWAY
**Given Information**:
  Increased plant growth rate after hormone application.
  Cell elongation primarily in the intercalary meristem.
**Method & Steps**:
 1. Identify the role of different plant hormones in growth.
  Reasoning:  Different plant hormones have different effects on plant growth and development.  We need to identify which hormone is primarily involved in cell elongation, especially in the intercalary meristem.
  Formula/Rule: None directly applicable.
 2. Analyze the location of the growth (intercalary meristem).
  Working: Intercalary meristems are located at the base of leaf blades or internodes. They are responsible for the elongation of stems and leaves.
  Key Point: The specific location of growth helps narrow down the possible hormones.
 3. Determine which hormone best fits the observed effects.
  Result: Gibberellins are known to stimulate cell elongation, particularly in the intercalary meristem, leading to increased stem and leaf growth.
  Verification: The other options are less likely. Auxin is involved in cell elongation, but primarily in apical meristems. Cytokinins promote cell division, not primarily elongation. Ethylene promotes fruit ripening and senescence.
 ## OPTION ANALYSIS
A :x: Auxin is involved in cell elongation but primarily in apical meristems, not intercalary.
B :x: Cytokinins primarily promote cell division, not elongation.
C :x: Ethylene is associated with fruit ripening and senescence, not significant stem elongation.
D ✓: Gibberellins are known to stimulate significant stem elongation, particularly via effects on the intercalary meristem.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the roles of different plant hormones:  Understanding the specific functions of auxin, cytokinin, gibberellin, and ethylene is crucial.
  2.Ignoring the location of growth (intercalary meristem): The location of growth is a key indicator of the hormone involved.
 **Quick Tips**:
  1.Remember the key roles: Auxin (apical dominance, cell elongation), Cytokinin (cell division), Gibberellin (stem elongation), Ethylene (fruit ripening).
  2.Associate intercalary meristem with stem elongation and thus, gibberellins.

Mr. NARESH KUMAR K · Answer

Auxin

Mr. NARESH KUMAR K · Answer

Cytokinin

Mr. NARESH KUMAR K · Answer

Ethylene

Mr. NARESH KUMAR K · Answer

The correct Option is "Gibberellin"

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