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Avena coleoptile curvature is used for the bioassay of auxin.

1. Avena coleoptile curvature is a bioassay.
2. Auxin is tested using Avena coleoptile.
3. Avena coleoptile curvature tests auxin.
4. Avena coleoptile is used for auxin bioassay.

Correct answer: Avena coleoptile is used for auxin bioassay.

Solution

Avena coleoptile curvature is a classic biological test used to detect and estimate auxin. So the correct statement is that Avena coleoptile is used for auxin bioassay.

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