NEET BIOLOGY

Detailed explanation-1: -Microbes digest organic waste by stealing its oxygen, altering the chemical makeup of the material into a less environmentally damaging matter.

Detailed explanation-2: -Bacteria play an important role in water purification in drinking water treatment systems. On one hand, bacteria present in the untreated water may help in its purification through biodegradation of the contaminants. On the other hand, some bacteria may be human pathogens and pose a threat to consumers.

Detailed explanation-3: -It helps aerobic bacteria to grow which decompose organic matter like human and animal waste. After several hours, the suspended microbes settle at the bottom of the tank as activated sludge. The water is then removed from the top.

Detailed explanation-4: -Secondary Treatment The secondary stage of treatment removes about 85 percent of the organic matter in sewage by making use of the bacteria in it.

Detailed explanation-5: -Aerobic Bacteria This bacterium uses the free oxygen within the water to degrade the pollutants in the wastewater and then converts it into energy that it can use to grow and reproduce.