In the **Avena curvature test**, the angle of curvature of the decapitated coleoptile is:
AIndependent of auxin concentration
BDirectly proportional to the amount of auxin in the agar block placed on it
CInversely proportional to auxin
DDetects gibberellin only
Answer & Solution
Correct answer: B. Directly proportional to the amount of auxin in the agar block placed on it
Went's Avena test: agar block infused with auxin placed asymmetrically on decapitated oat coleoptile causes curvature; angle of bending ∝ auxin concentration in block. First **bioassay** for plant hormones. (For low concentrations; saturates at high.)
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