The bioassay of auxin is

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Bioassay is the testing of biological activity of a substance by employing living material. Went used Avena sativa (oat) coleoptiles in a technique called Avena coleoptile curvature test. ABA or abscisic acid induces dormancy in buds, seeds and underground storage organs. Unorganised and undifferentiated mass of cells forms during culture of cells known as callus. In callus culture, shoot and root regenerations are controlled, generally by auxin and cytokinin balance.