Question

Which of the following are the causes of water pollution ?

• A. Chemical pollutants
• B. Organic wastes
• C. Pathogens
• D. All of the above.

Answer 1

The correct option is D All of the above.

Causes of water pollution :

1. Pathogens
2. Organic wastes
3. Chemical pollutants

Pathogens: Disease causing water pollutants are ​called pathogens. Pathogens include bacteria ​and other organisms that enter water from domestic sewage and animal excreta.​

Organic waste: Organic matter such as leaves, grass etc. are major water pollutants. They pollute the water as a consequence of decay i.e. run off. Excessive phytoplankton growth in water bodies is also a cause of water pollution. ​Organic wastes are biodegradeable.

Chemical pollutants : The chemical industries have significant impact on the environment due to pollution issues. Wastewater from chemical industry contains pollutants. These pollutants are toxic, carcinogenic, and mostly nonbiodegradable