Biology · PYQ NEET UG 2016(1)
हिन्दीA river with an inflow of domestic sewage rich in organic waste may result in:
Correct answer · Option 4
Death of fish due to lack of oxygen.
Explanation
Biodegradable organic waste in sewage increases Biological Oxygen Demand (BOD), severely depleting dissolved oxygen levels in the water and resulting in the death of fish and other aquatic life.