Multiple choice

Avena coleoptile bioassay is used for detection of

  1. gibberellins

  2. cytokinins

  3. auxins

  4. abscissic acid
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C Correct answer
Explanation

The Avena coleoptile curvature test is a specific bioassay developed by F.W. Went and others to detect and quantify auxins (indole-3-acetic acid and related compounds). When auxin is applied asymmetrically to a decapitated oat coleoptile, it causes cell elongation and curvature proportional to the auxin concentration. This test is not specific for gibberellins, cytokinins, or abscisic acid, which have different bioassays.

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