Short Answer TypeName the two different categories of microbes naturally occurring in sewage water. Explain their role in cleaning sewage water into usable water.
Study the graph given below. Explain how oxygen concentration is affected in the river when sewage is discharged into it.
The diagram above is that of a typical biogas plant. Explain the seQ uence of events occurring in a biogas plant. Identify a, b and c.
Name a free-living and a symbiotic bacterium that serve as bio-fertilizer. Why are they called so?
Free-living - Azotobacter, Symbiotic - Rhizobium serve as bio-fertilizers.
They are called bio-fertilizers because they are organisms found in nature that enrich the nutrient quality of the soil.
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