Question

Auxin can be bioassayed by:

• A. Lettuce hypocotyl elongation
• B. Avena coleoptile curvature
• C. Hydroponics
• D. Potometer

Answer 1

The correct option is B Avena coleoptile curvature

The Avena curvature test is a bioassay for auxin that measures the angle of curvature of a decapitated coleoptile after placing an agar block containing auxin on one side.
The Cholodny-Went theory, which states that plant tropisms in roots and shoots are due to the unequal distribution of the growth regulator auxin in reponse to light or gravity, presented a simple and direct explanation of these phenomena.