Official Answer Key & Detailed Solution
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Correct Answer: Option (A) — 1 and 2 only
Concept & Option Breakdown
Standard Reference VerifiedCowpea (Vigna unguiculata) and Green gram (Vigna radiata) are fast-growing leguminous crops widely cultivated as edible pulses, rich animal fodder, and rapidly decomposing green manure for soil nitrogen enrichment. Pigeon pea (Arhar/Tur) is a long-duration woody shrub primarily grown as a pulse crop; due to its woody stems, slow initial growth, and long maturity cycle, it is not traditionally suited for green manuring.
Green manure requires quick vegetative biomass accumulation and soft succulent stems that decompose quickly upon plowing, fitting herbaceous short-duration legumes like cowpea and green gram.
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