Question

The Avena curvature is used for bioassay of

• A. Ethylene
• B. IAA
• C. GA₃
• D. ABA

Answer 1

The correct option is B

IAA

The correct option is B

Explanation of the correct option:

1. The auxin bioassay is performed using the Avena curvature test. IAA is a naturally occurring auxin.
2. Avena is a grass family that includes Eurasian and African species.
3. Avena's geo-curvature test is a bioassay for auxin-type growth regulators.
4. The measurement is done in special perspex trays using etiolated oat coleoptiles in diffuse daylight.

Explanation of the incorrect option:

Option A:

The ethylene bioassay is based on the triple response principle, which involves three distinct effects of ethylene on etiolated pea seedlings.

Option C:

The dwarf maize/pea test and the cereal endosperm test are used in the Gibberellin bioassay.

Option D:

The Rice seedling growth inhibition test is a bioassay of abscisic acid.

Final answer: The Avena curvature is used for the bioassay of IAA.