Question

If pollutants are added continuously in a water body, they will cause ______.

Options

• increase in BOD

• decrease in BOD

• death of all plants

• death of animals but plants will survive

Answer 1

If pollutants are added continuously to a water body, they will cause an increase in BOD.

Explanation:

If pollutants, especially organic waste, are continuously added to a water body, the biochemical oxygen demand (BOD) increases. This is because microorganisms consume more oxygen to decompose the organic matter present in pollutants. As a result, oxygen levels in water decrease, harming aquatic life, but initially increasing the demand for oxygen as microbes work to break down the pollutants.