The Question is from neet-botany plant-growth-and-development , and it was created by the author D VINOD

Question

Which gaseous phytohormone is involved in abscission of leaves and flowers?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B. Ethylene
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant Hormones and their effects
 **Related Topics**: Abscission, Ethylene action
 **Prerequisites**: Basic understanding of plant physiology and plant hormones.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the gaseous phytohormone involved in abscission.
  Options are Abscisic acid, Ethylene, Gibberellic acid, and Cytokinin.
**Method & Steps**:
 1. Identify the gaseous phytohormone among the options.
  Reasoning: Ethylene is a gaseous hormone.
  Formula/Rule: N/A
 2. Recall the function of Ethylene.
  Working: Ethylene is known for its role in abscission, along with fruit ripening and senescence.
  Key Point:  Ethylene stimulates the production of enzymes that weaken the cell walls at the abscission zone.
 3. Select the correct option.
  Result: Ethylene (B) is the correct answer.
  Verification: The established role of ethylene in abscission confirms the answer.
 ## OPTION ANALYSIS
A :x: Abscisic acid is involved in dormancy and stress responses.
C :x: Gibberellic acid is involved in stem elongation and seed germination.
D :x: Cytokinins promote cell division and delay senescence.
B ✓: Ethylene is the gaseous phytohormone responsible for abscission.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing ethylene with abscisic acid, which has an opposing effect on leaf fall.
  How to avoid: Understand that abscisic acid inhibits growth and promotes dormancy while ethylene promotes abscission.
  2.Failing to recognize ethylene's role beyond fruit ripening.
  How to avoid: Learn about the diverse functions of ethylene in plant development.
 **Quick Tips**:
  1.Remember that ethylene is involved in both abscission and ripening.
  2.Associate ethylene with processes of aging and detachment in plants.

D VINOD · Answer

Abscisic acid

D VINOD · Answer

The correct Option is "Ethylene"

D VINOD · Answer

Gibberellic acid

D VINOD · Answer

Cytokinin

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