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Plant Growth and Development

Multiple Choice Questions

61.

In callus culture, roots can be induced by the supply of

auxin
cytokinin
gibberelin
ethylene

62.
The bioassay of auxin is

avena curvature test

callus formation

culture of fungus

seed dormancy

avena curvature test

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. In callus culture, shoot and root regenration is generally controlled by auxin and cytokinin ratio.