ABA Discovery and PGR Scientists — Match Column for NEET
📚 Practice ConceptDuring mid-1960s, three independent researches reported the purification and chemical characterisation of three different kinds of inhibitors: inhibitor-B, abscission II and dormin. Later all the three were proved to be chemically identical. It was named abscisic acid (ABA). H.H. Cousins (1910) confirmed the release of a volatile substance from ripened oranges that hastened the ripening of stored unripened bananas. Later this volatile substance was identified as ethylene, a gaseous PGR.
E. Kurosawa isolated auxin from oat seedlings and F.W. Went described bakanae disease.
F.W. Went ISOLATED AUXIN from oat seedling tips. E. Kurosawa described bakanae disease and identified GIBBERELLIN from sterile filtrates.
WENT = Went to collect Auxin. KURO = Kurosawa = Kuro-sawa-Gibberellin-baKanae (bakanae disease).
- ABA = Inhibitor-B = Abscission II = Dormin — three names for one chemical compound.
- H.H. Cousins 1910: ripened oranges → volatile → ripened bananas → volatile = ethylene.
- Gibberellin: Kurosawa from bakanae disease (foolish seedling — abnormal elongation in rice).
- Miller et al.: isolated and crystallised kinetin (first cytokinin) from autoclaved herring sperm DNA.
Match Column I (Scientist) with Column II (Discovery / Key Finding): Column I A. Charles and Francis Darwin B. F.W. Went C. E. Kurosawa D. Miller et al. E. H.H. Cousins Column II 1. Hastened ripening of bananas by volatile from ripened oranges 2. Identification and crystallisation of kinetin 3. Bakanae disease symptoms in sterile filtrates 4. Unilateral illumination response in canary grass coleoptiles 5. Isolation of auxin from oat seedling tips
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Correct answer: A — A-4, B-5, C-3, D-2, E-1
A-4: Darwin observed unilateral illumination response in canary grass coleoptiles (phototropism observation). B-5: F.W. Went isolated auxin (IAA) from oat seedling tips. C-3: Kurosawa — bakanae disease in rice from sterile filtrates → gibberellin discovery. D-2: Miller et al. — identification and crystallisation of kinetin (cytokinin). E-1: H.H. Cousins (1910) confirmed volatile from ripened oranges ripened bananas → ethylene.
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