The life insurance sector is rising higher on Friday with blue chips Standard Life and Aviva among those performing well.Aviva - which yesterday announced it had ramped up profits by 35% last year - was given an extra lift by Japanese broker Nomura which said that the group offers investors good growth prospects at an attractive price after an impressive 2010.Tobacco giants British American Tobacco and Imperial Tobacco are providing a drag on the sector.Top performing sectors so far todayAlternative Energy 2,657.69 +2.20%Life Insurance 4,568.49 +1.93%General Retailers 1,633.56 +1.87%Real Estate Investment Trusts 2,204.19 +1.80%Industrial Engineering 6,844.51 +1.72%Bottom performing sectors so far todayTobacco 28,610.33 -0.69%Technology Hardware & Equipment 794.27 -0.22%Automobiles & Parts 4,926.30 -0.19%Banks 4,906.43 -0.12%Aeronautics and Defence NULL 0.00%