Plant Growth Regulators: ABA & Ethylene — NEET Biology
📚 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.
Match the Column I (Scientist/PGR) with Column II (Associated Discovery/Physiological Effect). 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 stored unripened bananas 2. Identification and crystallization of kinetin 3. Bolting in beet and cabbages 4. Observation of unilateral illumination response in canary grass coleoptiles 5. Isolation of auxin from oat seedling tips 6. Appearance of 'bakanae' disease symptoms in sterile filtrates
Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.