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Question: Answered & Verified by Expert
What causes the decline in dissolved oxygen in the receiving water body after discharge of sewage into a river?
BiologyEnvironmental IssuesNEET
Options:
  • A Increase in micro-organisms
  • B Decrease in micro-organisms
  • C Increase in biodegradable organic matter
  • D Decrease in biodegradable organic matter
Solution:
1307 Upvotes Verified Answer
The correct answer is: Increase in micro-organisms
Micro-organisms involved in biodegradation of organic matter in the receiving water body consume a lot of oxygen, causing a sharp decline in dissolved oxygen downstream from the point of sewage discharge.

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