Question

The name of a gaseous plant hormone is

• A. IAA
• B. Gibberellin
• C. Ethylene
• D. Abscisic acid

Answer 1

The correct option is C

Ethylene

The correct option is C.

Explanation of correct option:

1. Ethylene belongs to a group of plant growth regulators that are commonly used to accelerate fruit ripening and enhance the number of blooms and fruits produced.
2. Ethylene, often known as the ripening hormone, is a gaseous plant hormone.
3. Ripening fruits, flowers, leaves, and even roots synthesize it.
4. It causes changes in texture, softness, color, and other processes in fruits by triggering a series of events.

Explanation of incorrect option:

Option A:

1. IAA is the most common auxin-like plant hormone, and it controls many aspects of plant growth and development.

Option B:

1. Gibberellins are hormones that promote bolting (stem elongation) and reverse dwarfism by lengthening the internodal space.
2. They are not gaseous hormones since they are tetra carbocyclic compounds with a gibbane structure with four carbon rings.

Option D:

1. GAs are counteracted by ABAs.
2. It affects abscission and dormancy by inhibiting plant metabolism.
3. It's also known as the "stress hormone" since it boosts plant tolerance.

Final answer: The name of a gaseous plant hormone is ethylene.