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Biology · PYQ NEET UG 2016(1)

हिन्दी

A river with an inflow of domestic sewage rich in organic waste may result in:

  1. An increased production of fish due to biodegradable nutrients.
  2. Increased population of aquatic food web organisms.
  3. Drying of the river very soon due to algal bloom.
  4. Death of fish due to lack of oxygen.

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.
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