Microbes in Environmental Management — DU B. Sc. (Hons) Microbiology Previous Year Question Papers

1. Differentiate between any three of the following : 2. (a) Ammonification and Nitrification (b) Free-living and symbiotic nitrogen fixers (d) Activated sludge process and Septic tank (a) Define bioleaching and explain the process for recovery of gold. (6) (b) Explain the steps of primary sewage treatment. 3. Briefly explain the following : (a) Oxidation Pond (b) Bioremediation of petroleum oil contamination in soil 4. (a) Explain the role of microorganisms in e-waste management. (6) (b) Discuss the microbial degradation of 2,4-D. (6) 5. 6. (a) What are biofuels? Discuss the advantages of using biofuels over fossil fuels. (5) (b) What is the composition of biogas? Give examples of microorganisms involved. (4) (c) Why are COD values always higher than BOD? (a) Explain how solid wastes are disposed off by composting? (6) (b) Discuss the degradation of cellulose, giving examples of microorganisms. (6) 1. Differentiate between any three of the following : 2. (a) Ammonification and Nitrification (b) Free-living and symbiotic nitrogen fixers (d) Activated sludge process and Septic tank (a) Define bioleaching and explain the process for recovery of gold. (6) (b) Explain the steps of primary sewage treatment. 3. Briefly explain the following : (a) Oxidation Pond (b) Bioremediation of petroleum oil contamination in soil 4. (a) Explain the role of microorganisms in e-waste management. (6) (b) Discuss the microbial degradation of 2,4-D. (6) 5. 6. (a) What are biofuels? Discuss the advantages of using biofuels over fossil fuels. (5) (b) What is the composition of biogas? Give examples of microorganisms involved. (4) (c) Why are COD values always higher than BOD? (a) Explain how solid wastes are disposed off by composting? (6) (b) Discuss the degradation of cellulose, giving examples of microorganisms. (6)