Question:
The common bio-assay used to detect the hormone brassinosteroid is
The common bio-assay used to detect the hormone brassinosteroid is
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Brassinosteroid bioassay: Dwarf rice lamina inclination.
Cytokinin bioassay: Cucumber cotyledon expansion.
Ethylene bioassay: Triple response.
Auxin bioassay: Oat coleoptile elongation.
Cytokinin bioassay: Cucumber cotyledon expansion.
Ethylene bioassay: Triple response.
Auxin bioassay: Oat coleoptile elongation.
Updated On: Sep 1, 2026
- Dwarf rice lamina inclination bio-assay
- Cucumber cotyledon expansion bio-assay
- Triple response bio-assay in etiolated seedling
- Oat coleoptile elongation bio-assay
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of plant hormone bioassays.
Step 2: Detailed Explanation:
Dwarf rice lamina inclination bio-assay is used to detect brassinosteroids.
In this assay, brassinosteroids cause the lamina of dwarf rice to incline (bend).
Cucumber cotyledon expansion (B): Used for cytokinins.
Triple response (C): Used for ethylene (in etiolated seedlings).
Oat coleoptile elongation (D): Used for auxins.
Thus, the dwarf rice lamina inclination assay is for brassinosteroids.
Step 3: Final Answer:
Thus, the common bio-assay for brassinosteroids is the dwarf rice lamina inclination bio-assay, which corresponds to option (A).
[0.5cm]
This question tests knowledge of plant hormone bioassays.
Step 2: Detailed Explanation:
Dwarf rice lamina inclination bio-assay is used to detect brassinosteroids.
In this assay, brassinosteroids cause the lamina of dwarf rice to incline (bend).
Cucumber cotyledon expansion (B): Used for cytokinins.
Triple response (C): Used for ethylene (in etiolated seedlings).
Oat coleoptile elongation (D): Used for auxins.
Thus, the dwarf rice lamina inclination assay is for brassinosteroids.
Step 3: Final Answer:
Thus, the common bio-assay for brassinosteroids is the dwarf rice lamina inclination bio-assay, which corresponds to option (A).
[0.5cm]
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