Question

The biological activity of IAA is tested by

• A. Alpha amylase test
• B. Avena curvature test
• C. Soyabean callus test
• D. Xanthium leaf disc test

Answer 1

The correct option is B Avena curvature test

The shoot tip of a plant is removed and placed on an agar block so that the auxin diffuses into the agar. The agar piece is cut after some time and is placed on one side of the coleoptile of the plant from where the shoot tip was obtained. An angle of curvature is obtained. This is called avena curvature that helps in determining the biological activity of IAA. Thus the correct answer is option B.