Question:
Which phytohormone is called secondary hormone?
Which phytohormone is called secondary hormone?
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Ethylene is the only gaseous plant hormone and plays a key role in fruit ripening.
Updated On: Feb 9, 2026
- Cytokinins
- Auxins
- Gibberellins
- Ethylene
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding primary and secondary hormones.
Plant hormones are classified based on their broad physiological roles. Auxins, gibberellins, and cytokinins are considered primary growth hormones.
Step 2: Nature of ethylene.
Ethylene is a gaseous phytohormone involved mainly in fruit ripening, senescence, and abscission rather than primary growth promotion.
Step 3: Analysis of options.
(A) Cytokinins: Primary growth hormone.
(B) Auxins: Primary growth hormone.
(C) Gibberellins: Primary growth hormone.
(D) Ethylene: Correct — regarded as a secondary hormone.
Step 4: Conclusion.
The phytohormone called secondary hormone is ethylene.
Plant hormones are classified based on their broad physiological roles. Auxins, gibberellins, and cytokinins are considered primary growth hormones.
Step 2: Nature of ethylene.
Ethylene is a gaseous phytohormone involved mainly in fruit ripening, senescence, and abscission rather than primary growth promotion.
Step 3: Analysis of options.
(A) Cytokinins: Primary growth hormone.
(B) Auxins: Primary growth hormone.
(C) Gibberellins: Primary growth hormone.
(D) Ethylene: Correct — regarded as a secondary hormone.
Step 4: Conclusion.
The phytohormone called secondary hormone is ethylene.
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