Auxins can be bioassayed by by
(a) Hydroponics     (b) Potometer    (c)  Lettuce hypocotyl elongation   (d)   Avena coleoptile curvature

Dear student.

The correct option is d. Avena coleoptile curvature.

Please refer the link below:

https://www.meritnation.com/ask-answer/question/avena/plant-growth-and-development/3471503

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