NEET 2016 Phase 1 · BiologyPrevious Year Question
The avena curvature is used for bioassay of:
Answer: (C) IAA. Answer: (C) IAA.
- A.ABA
- B.GA3
- C.IAA✓
- D.Ethylene
Correct Answer
(C) IAA
Solution & Explanation
Answer: (C) IAA. Solution: The Avena (oat) coleoptile curvature test is the classic bioassay for auxin (IAA), since auxin diffusing from a tip applied off-centre causes measurable curvature. Auxin was historically isolated from oat coleoptile tips by Went, linking the assay to IAA; ABA, GA3 and ethylene are assayed by other methods, so they are wrong. NCERT: Ch 13, p.174, line ~47: "Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedlings.".
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