NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES

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Understanding +4 | -1

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

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Correct option: A

If both Assertion and Reason are true and Reason is the correct explanation of Assertion

Option A (If both Assertion and Reason are true and Reason is the correct explanation of Assertion) is correct because sewage discharge increases organic matter, which is then decomposed by microorganisms that consume oxygen, leading to a decline in dissolved oxygen.

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Supreme court of India has ordered the Delhi government to take measures to improve the quality of air. The government started to use _________________ in public fleet. The unfavorable alteration of environment due to human activities is termed as The polluting strength of sewage is usually characterized by its A lake near a village suffered heavy mortality of fishes with in a few days. Consider the following reasons for this.
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