Biology · MICROBES IN HUMAN WELFARE

Match List-I with List-II: List-I List-II A Primary treatment I Microbial digestion in anaerobic sludge digesters B Flocs II Physical removal of particles through filtration and sedimentation C Activated sludge III Masses of bacteria associated with fungal filaments D Biogas production IV Sediment formed after secondary treatment aeration Choose the correct answer from the options given below:

1. A-(II), B-(III), C-(IV), D-(I)
2. A-(I), B-(II), C-(III), D-(IV)
3. A-(IV), B-(I), C-(II), D-(III)
4. A-(III), B-(IV), C-(I), D-(II)