IGNOU BBYCT 137 2026 - Bioassays for auxins

Question

Bioassays for auxins

31 Jan 2026

Answer :

Word Count : 230

Bioassays for auxins are experimental techniques used to determine the presence, concentration, and biological activity of auxins, a class of plant hormones that regulate growth and development. These bioassays rely on the ability of auxins to promote cell elongation, inhibit lateral bud growth, and induce root formation. One common method is the Avena curvature test, which measures the bending response of oat coleoptiles to auxin application. In this test,

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Column A	Column B
i) Boron	a) Component of ferredoxin
ii) Molybdenum	b) Needed for synthesis of auxins
iii) Zinc	c) Component of nitrogenase
iv) Iron	d) Pollen germination