A) auxins
B) gibberellins
C) cytokinins
D) ethylene
Correct Answer: A
Solution :
Measurement of the effect of a known or suspected biologically active substance on living material is called as bioassay. Avena curvature test was first time performed by Went for measuring the activity of auxin hormone. This technique is effective for 1AA concentrations of about .02 to \[0.2\,\,mg\,{{L}^{-1}}\].
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