Question

Continuous sewage flow into a stream would lead to

• A. Eutrophication
• B. Algal bloom
• C. Depletion of oxygen
• D. Increase in temperature

Answer 1

The correct option is C Depletion of oxygen

Discharge of untreated sewage into streams which contains high quantity of nutrients induce the disproportionate growth of algae causing eutrophication which results into depletion of dissolved oxygen in the water. The continuous flow of sewage reduces the self-purification capacity of the water body. The condition of hypoxia arises due to depletion of oxygen. Increase in temperature favours the eutrophication and algal bloom is the cause of eutrophication. Depletion of oxygen is the adverse effect of the eutrophication.

Hence, the correct answer is 'Depletion of oxygen'.