What is B.O.D.:
1. The amount of utilized by organisms in the water
2. The amount of utilized by microorganisms for decomposition
3. The total amount of present in water
4. All of the above
Escherichia coli is used as an indicator organism to determine the pollution of water with:
1. Heavy metals
2. Faecal matter
3. Industrial effluents
4. Pollen of aquatic plants
A major component of gobar gas is:
1. Methane
2. Ethane
3. Butane
4. Ammonia
Common indicator organism of water pollution is:
1. Eichhornia crassipes
2. Escherichia coli
3. Entamoeba histolytica
4. Lemna pancicostata