Avena curvature test is a bioassay for examining the activity of

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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 Went. 10^ curvature is produced by auxin concentration of 150 g / lit at 25^ C and 90 % relative humidity. It can measure auxin upto 300 g /itre. 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 vertically