The Bombay Stock Exchange benchmarkSensex fell by 105 points in opening trade today The 30-share Sensex, which lost 78.01 points in the previous session, moved down further by 105.18 points, or 0.64 per cent, to 16,340.84 in opening trade.In a similar fashion, the wide-based National Stock Exchange Nifty index declined by 36.35 points, or 0.73 per cent, to 4,909.55.