Benchmark equity indices Sensex and Nifty rebounded sharply on Monday, surging nearly 2 per cent, on heavy buying in Reliance Industries and a rally in Asian markets. The 30-share BSE Sensex jumped 1,240.90 points or 1.76 per cent to settle at 71,941.57. During the day, it soared 1,309.55 points or 1.85 per cent to 72,010.22. The Nifty climbed 385 points or 1.80 per cent to 21,737.60.