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

Question

Ethylene is unique among plant growth regulators due to its:

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant growth regulators and their properties
 **Related Topics**: Plant hormones, ethylene biosynthesis, gaseous signaling in plants
 **Prerequisites**: Basic understanding of plant physiology and the roles of different plant hormones.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the unique characteristic of ethylene among plant growth regulators.
  Options: Ability to promote cell division, role in seed dormancy, gaseous nature, synthesis in the root apical meristem.
**Method & Steps**:
 1. Analyze each option to determine which property is unique to ethylene.
  Reasoning:  We need to consider the properties of other plant hormones like auxins, gibberellins, cytokinins, abscisic acid etc., to compare with ethylene.
  Formula/Rule: None directly applicable.
 2. Compare ethylene's properties with other plant hormones.
  Working: Ethylene is a gaseous hormone, unlike the others which are typically solid or liquid at normal temperatures and pressures.  While ethylene plays a role in many processes mentioned in other options, its gaseous nature is what sets it apart.
  Key Point: The gaseous nature allows for easy diffusion and affects plant tissues broadly.
 3. Identify the unique property.
  Result: The gaseous nature is the unique characteristic of ethylene among plant growth regulators.
  Verification:  Confirm that the other options are not exclusive to ethylene. Cell division is promoted by other hormones as well.  Seed dormancy is influenced by ABA (abscisic acid) primarily. Root apical meristems are not the sole site of ethylene synthesis.
 ## OPTION ANALYSIS
A :x: Ability to promote cell division:  Other plant hormones also promote cell division.
B :x: Role in seed dormancy: Abscisic acid (ABA) is primarily responsible for seed dormancy.
C ✓: Gaseous nature: This is unique to ethylene among major plant growth regulators.
D :x: Synthesis in the root apical meristem: Ethylene is synthesized in various plant tissues, not exclusively in the root apical meristem.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing ethylene's roles with other hormones: Students might mistakenly think that ethylene's other roles are unique.
  How to avoid: Thoroughly understand the functions of all major plant hormones and their differences.
  2.Overlooking the physical state: Focusing solely on the physiological effects and neglecting the physical properties of the hormone.
  How to avoid: Pay close attention to the physical properties of the plant hormones mentioned in the question.
 **Quick Tips**:
  1.Remember that ethylene is a gas that diffuses easily through the plant.
  2.Compare and contrast the characteristics of various plant hormones to identify unique features.

K SURESH KUMAR · Answer

Ability to promote cell division

K SURESH KUMAR · Answer

Role in seed dormancy

K SURESH KUMAR · Answer

The correct Option is "Gaseous nature"

K SURESH KUMAR · Answer

Synthesis in the root apical meristem

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