The bioassay of auxin is

Options

(a) Avena curvature test
(b) callus formation
(c) culture of fungus
(d) seed dormancy

Correct Answer:

Avena curvature test

Explanation:

Bioassay is a testing of biological activity like growth response of a substance by employing plant part. Avena curvature test is a bioassay for examining the activity of auxins. It is based upon experiments of F.W.Went. 10° curvature is produced by auxin concentration of 150 mg/lit at 25⁰ C and 90% relative humidity. It can measure auxin up to 300 mg/lit. Auxin from shoot tip or any other plant organ is allowed to diffuse in a standard size agar block. 15 -30 mm long oat coleoptile grown in dark is held ve