Question

Avena coleoptile auxin is

• A. IBA
• B. Indole 3-lactic acid
• C. Indole 2-acetic acid
• D. Indole 3-acetic acid

Answer 1

The correct option is D Indole 3-acetic acid

Bioassay is a sensitive and specific test that determines the biological activity of hormones by measuring its effect on a specific part of plant material. There are various bioassays to determine the concentration of auxin hormone in plant such as avena coleoptile test, split pea stem curvature test, cress root inhibition test. The Avena coleoptile test is a bioassay for IAA (indole-3-acetic acid) that measures the angle of curvature of a decapitated coleoptile after placing an agar block containing auxin on one side.

Thus, the correct answer is option D.