Multiple choice

A city’s sewage was disposed into a water body. It was noticed that the aquatic animals in the body started dying. What effect of sewage led to the death of aquatic life?

  1. Utilisation of oxygen from water body

  2. Utilisation of CO2 from water

  3. Increasing temperature of water body

  4. Increasing metal content in water body

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sewage is an oxygen-consuming material. It decreases the oxygen content of the water body and thus, the amount of oxygen available for aquatic organisms decreases.