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Pune University - Evolution, Ecology and Environmental Microbiology, April 2010

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Total No. of Questions : 5] [Total No. of Pages : 2 P1010 [3725] - 202 M.Sc. MICROBIOLOGY MB - 602 : Evolution, Ecology and Environmental Microbiology (2008 Pattern) Time : 3 Hours] [Max. Marks : 80 Instructions to the candidates: 1) All questions are compulsory. 2) All questions carry equal marks. 3) Draw neat labeled diagrams wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, electronic pocket calculator is allowed. 6) Assume suitable data, if necessary. Q1) Attempt any one of the following : [16] a) Explain how a malfunctioning settler-clarifier can adversely affect the efficiency of an activated sludge process. Give relevant equations for mass balance in explaining the feature. b) Discuss the evolutionary stability of cooperation among microorganisms. Explain with suitable examples how the cooperative and competitive interactions influence this stability. Q2) Attempt any two of the following : [16] a) Describe the advantages and disadvantages of various granular medium filters used for wastewater treatment. b) Discuss the bacterial growth in the marine ecosystem and its regulation by environmental conditions. c) Discuss mycorrhizal associations with special reference to host-fungus specificity and interactions with non-host plants. P.T.O. Q3) Attempt any two of the following : [16] a) Discuss the diversity of secondary metabolites in the evolutionary context. b) Elaborate on the mode of action of various plant products as antimicrobial agents. c) Describe the reaction mechanisms of chemical precipitation, as a unit process in the treatment of wastewaters. Q4) Write short notes on any four of the following : a) Working principle of an UASB digester. b) Reuse of treated solid wastes. c) Industrial ETP layout for dairy waste. d) Neo-Darwinism. e) Significance of DOM in marine ecosystem. [16] Q5) A wastewater has the following characteristics : [16] Flow rate : 10200 m3/d BOD 5: 290 mg/L The process by which it is to be treated is the activated sludge process with recycle. The MPCB has imposed a discharge limit of BOD5 = 10 mg/L. Assuming MLSS in the aeration basin = 3750 mg/L, MLSS in clarifier sludge = 13500 mg/L, MCRT = 8 days, kinetic coefficients, kd = 0.06 d-1 and Y = 0.6, Determine the following : a) The hydraulic retention time. b) The mass of sludge wasted daily. c) The F/M ratio. vvvv [3725]-202 2

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Additional Info : M.Sc. MICROBIOLOGY, MB - 602 : Evolution, Ecology and Environmental Microbiology (2008 Pattern), Pune University
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