Indian government bonds rebounded in volatile trade on Tuesday, with the benchmark 10-year yield logging its biggest single-day decline in three months after a failure to breach a key upside level triggered value buying.Brent crude whipsawed between $114.40 and $117 a barrel in Asian trade, driving sharp intraday swings in the debt market of the world's third-largest oil importer.The yield on the benchmark 6.94% 2036 bond briefly tested 7.50% before falling nearly 5 basis points to 7.4360%, easing for the first time in nearly a week and most since July 27.