Discussion
The hormone auxin was first discovered in :
Answer: C
Auxin was first discovered in oats.
The decisive work used oat (Avena sativa) coleoptiles. F.W. Went in 1928 placed coleoptile tips on agar blocks, showed that the blocks alone could make decapitated coleoptiles bend, and named the diffusible growth substance auxin. The Avena curvature test became the classic bioassay for it.
Darwin's earlier phototropism experiments used canary grass. Mustard, pea and rice were not the plants in which auxin was discovered.
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