Question:
Which of the following is not a seed germination inhibitor
Which of the following is not a seed germination inhibitor
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The balance between Abscisic Acid (ABA) chemical inhibitors (like coumarin) and Gibberellic Acid (GA) determines seed germination.
GA promotes germination, while ABA and phenolics inhibit it.
GA promotes germination, while ABA and phenolics inhibit it.
Updated On: Jul 6, 2026
- Coumarin
- Phthalides
- Ferulic acid
- Gibberellic acid
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Seed germination is regulated by a delicate balance of hormonal and chemical promoters and inhibitors.
Inhibitors maintain seed dormancy, while promoters trigger the metabolic processes required for germination.
Step 3: Detailed Explanation:
- Coumarin (A), Phthalides (B), and Ferulic acid (C): These are phenolic and organic chemical compounds naturally present in seed coats or surrounding tissues of many species. They act as potent germination inhibitors to enforce dormancy until environmental conditions are optimal.
- Gibberellic acid (D): This is a classic plant hormone (gibberellin) that acts as a primary promoter of seed germination. It stimulates the de novo synthesis of hydrolases like \(\alpha\)-amylase, which break down stored starches into sugars to feed the growing embryo, effectively breaking dormancy.
Step 4: Final Answer:
Gibberellic acid is a germination promoter, not an inhibitor. Therefore, the correct option is (D).
Seed germination is regulated by a delicate balance of hormonal and chemical promoters and inhibitors.
Inhibitors maintain seed dormancy, while promoters trigger the metabolic processes required for germination.
Step 3: Detailed Explanation:
- Coumarin (A), Phthalides (B), and Ferulic acid (C): These are phenolic and organic chemical compounds naturally present in seed coats or surrounding tissues of many species. They act as potent germination inhibitors to enforce dormancy until environmental conditions are optimal.
- Gibberellic acid (D): This is a classic plant hormone (gibberellin) that acts as a primary promoter of seed germination. It stimulates the de novo synthesis of hydrolases like \(\alpha\)-amylase, which break down stored starches into sugars to feed the growing embryo, effectively breaking dormancy.
Step 4: Final Answer:
Gibberellic acid is a germination promoter, not an inhibitor. Therefore, the correct option is (D).
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