NEET BIOLOGY

Detailed explanation-1: -As organics are decomposed naturally in the sewage by bacteria and other microorganisms, the dissolved oxygen content of the water is depleted. This endangers the quality of lakes and streams, where high levels of oxygen are required for fish and other aquatic organisms to survive.

Detailed explanation-2: -Sewage discharges also pollute waterways with excess nutrients that wreak havoc on coastal ecosystems by fueling harmful algal blooms that put human health at risk, cause fish kills and smother coral reefs.

Detailed explanation-3: -The industrial water pollutants such as heavy metals (i.e., arsenic, mercury, cadmium, chromium, and lead) are poisonous. These pollutants are considered as priority pollutants because of their mobility and their toxicity in ecosystems.

Detailed explanation-4: -Sewage and wastewater contain bacteria, fungi, parasites, and viruses that can cause intestinal, lung, and other infections. Bacteria may cause diarrhea, fever, cramps, and sometimes vomiting, headache, weakness, or loss of appetite.

Detailed explanation-5: -The types of water pollution include: Groundwater Pollution. Surface Water Pollution. Suspended Matter.