NEET Biology question

Not in NEET syllabus

**Statement 1:** There is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. **Statement 2:** Microorganisms involved in the biodegradation of organic matter in the receiving water body consume a lot of dissolved oxygen.

(A)Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1Correct
(B)Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1
(C)Statement 1 is correct but statement 2 is incorrect
(D)Statement 1 is incorrect but statement 2 is correct

Answer: (A)

Solution

There is indeed a sharp decline in dissolved oxygen immediately downstream of a sewage discharge point (statement 1 correct), and this occurs precisely because microorganisms decomposing the added biodegradable organic matter

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Question ID VK-130413