Nicotine Nature & Classification: Nicotine [3-(1-methylpyrrolidin-2-yl)pyridine] is a natural heterocyclic pyridine-pyrrolidine alkaloid synthesized in the roots of Nicotiana tabacum and Nicotiana rustica and translocated to the foliage.
Insecticidal Mode of Action: Acts as an agonist on nicotinic acetylcholine receptors (nAChRs) in insect nervous systems, inducing synaptic block and paralysis; historically formulated as nicotine sulfate (40%) contact insecticide.
Other Classes: Limonoids and terpenoids are isoprene-derived bitter compounds (e.g., azadirachtin); carotenoids are tetraterpenoid pigments. (Correct answer: Option 4)
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Imazethapyr Classification: A selective, broad-spectrum systemic herbicide belonging to the imidazolinone chemical family.
Mode of Action: Inhibits the enzyme acetolactate synthase (ALS / AHAS), blocking the biosynthesis of branched-chain essential amino acids (valine, leucine, and isoleucine).
Crop Usage: Extensively recommended for selective control of both grassy weeds and broadleaf weeds in major legume crops like soybean, groundnut, and blackgram when applied as pre-emergence or early post-emergence. (Correct answer: Option 1)
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Jasmolin Occurrence: Jasmolin (comprising Jasmolin I and Jasmolin II) is one of the six natural insecticidal pyrethrin esters extracted from the dried flower heads of the pyrethrum plant, Tanacetum cinerariifolium (formerly Chrysanthemum cinerariifolium, family Asteraceae).
Constituents of Natural Pyrethrum: Pyrethrin I, Pyrethrin II, Cinerin I, Cinerin II, Jasmolin I, and Jasmolin II. (Correct answer: Option 4)
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EW Pesticide Formulation: EW stands for "Emulsion, oil in water" (water-based emulsion).
Physical State: Formulated as a stable dispersion of fine organic liquid/solvent droplets containing the active ingredient suspended in an external continuous aqueous phase with emulsifiers.
Advantage: Reduces volatile organic solvents and flammability compared to conventional Emulsifiable Concentrates (EC). (Correct answer: Option 1)
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"Matador" Herbicide: A widely used proprietary commercial trade name for the herbicide Metribuzin (a selective triazinone herbicide inhibiting photosystem II).
Metsulfuron-methyl Trade Name: Commonly marketed as "Algrip".
Sulfosulfuron Trade Name: Commonly marketed as "Leader".
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