Auxin can be bioassayed by:

Lettuce hypocotyl elongation

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Avena coleoptile curvature

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Hydroponics

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Potometer

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Solution

The correct option is B Avena coleoptile curvature
The Avena curvature test is a bioassay for auxin that measures the angle of curvature of a decapitated coleoptile after placing an agar block containing auxin on one side.
The Cholodny-Went theory, which states that plant tropisms in roots and shoots are due to the unequal distribution of the growth regulator auxin in reponse to light or gravity, presented a simple and direct explanation of these phenomena.

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