Question

Eutrophication of a water body:

• A. Leads to reduced nitrogen content
• B. Increases dissolved oxygen
• C. Enriches water quality
• D. Reduces dissolved oxygen, leads to fish mortality and impairs water quality

Hint:

Eutrophication effects:
- Algal blooms $\rightarrow$ Decomposition $\rightarrow$ Oxygen depletion.
- Fish kills and loss of biodiversity.
- Water quality impairment.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
This question tests knowledge of the effects of eutrophication.

Step 2: Detailed Explanation:
Eutrophication reduces dissolved oxygen (D) due to the decomposition of algal blooms.
This leads to fish mortality and impairs water quality.
Other options:
- Leads to reduced nitrogen content (A): Eutrophication increases nutrient levels.
- Increases dissolved oxygen (B): Eutrophication decreases dissolved oxygen.
- Enriches water quality (C): Eutrophication degrades water quality.
Thus, eutrophication reduces dissolved oxygen and harms aquatic life.

Step 3: Final Answer:
Thus, eutrophication reduces dissolved oxygen, leads to fish mortality, and impairs water quality, which corresponds to option (D).
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