After touching five-year low of 0.3 per cent in October, growth in key infrastructure output bounced back in November to 6.8 per cent, brightening prospects for industrial production for the month. Riding on a stellar growth in cement, electricity and refinery products, the eight infrastructure sectors which have weightage of 38 per cent in the overall Index of IndustrialProduction (IIP), considerably improved year-on-year as well from 3.7 per cent in November 2010.According to the data released on Monday, except for crude oil, natural gas and fertilizers, all other segments registered healthy growth in November. The maximum growth was witnessed in cement which expanded by 16.6 per cent, while there was a contraction of 4.3 per cent in the same period last fiscal.Electricity and steel output grew by 14.1 per cent and 5.1 per cent against 3.5 per cent and 7.6 per cent, respectively, in the same month last year. Coal and petroleum refinery products growth went up by 4.9 per cent and 11.2 per cent in November 2011.