Question

Name any three oxygen demanding biological pollutants of water?

Answer 1

Water pollution:

1. The water is said to be polluted when there is the introduction of harmful and toxic substances in the water and it is termed water pollution.

Three oxygen-demanding biological pollutants of water are:

1. Humus: Dead plants and plant products are termed humus and decomposition of it require oxygen.
2. Algae: The green layer that is formed on the water body is nothing but algal bloom and the growth of algae requires oxygen.
3. Sewage: The untreated sewage when introduced into the water decreases the amount of oxygen in the water.