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Answer: 3. IAA

Key idea: The Avena (oat coleoptile) curvature test is a bioassay for the auxin IAA.

Auxin placed on one side of a decapitated coleoptile makes it bend, and the angle is proportional to the auxin amount. Other hormones use different assays, e.g. GA3 uses dwarf-pea or barley endosperm tests.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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