Question:
Phenotypically tall plants can be obtained from genetically dwarf maize plants by application of ________
Phenotypically tall plants can be obtained from genetically dwarf maize plants by application of ________
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Hormone effect:
Gibberellins $\rightarrow$ Stem elongation $\rightarrow$ Tall plants
Updated On: May 8, 2026
- Gibberellins
- Auxins
- Ethylene
- ABA
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Concept: Plant growth regulators (hormones) control various aspects of plant development.
• Gibberellins promote stem elongation and cell growth.
• They can overcome genetic dwarfism in plants.
Step 1: Understand dwarfism in plants.
Dwarf plants may lack sufficient gibberellin production or response.
Step 2: Effect of gibberellins.
Application of gibberellins stimulates elongation of stem, making plants appear tall.
Step 3: Analyze options.
• (A) Gibberellins: Promote elongation (correct)
• (B) Auxins: Mainly cell elongation in specific regions
• (C) Ethylene: Promotes fruit ripening
• (D) ABA: Growth inhibitor
Step 4: Conclusion.
Thus, gibberellins can convert dwarf plants into tall phenotype. Final Answer: Option (A)
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