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The Avena curvature is used for bioassay of

1. ABA
2. GA3
3. IAA
4. Ethylene

Correct answer: IAA

Solution

The Avena curvature test is a classic bioassay for auxin activity, especially indole-3-acetic acid (IAA). Auxin causes unequal elongation on opposite sides of the oat coleoptile, producing curvature.

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