Question

Eutrophication leads to death of fish due to

• A. increased $O_2$ content
• B. increased algal content
• C. decreased $O_2$ content
• D. decreased algal content

Answer 1

The correct option is C

decreased $O_2$ content

The correct option is C

Explanation of the correct answer:

Excessive plant and algal growth is a symptom of eutrophication, which is produced by an increase in the availability of one or more photosynthesis-limiting growth nutrients. The fish will die as a result of the lack of oxygen.

Explanation of the incorrect answers:

Option A:

1. High quantities of oxygen or other natural gases such as carbon dioxide can induce gas bubble disease in fish due to an accumulation of a gas (Oxygen) in the fish's gills, skin, or blood.
2. As a result, fish can perish.

Option B:

1. Algal blooms can make it difficult for fish and other aquatic creatures to locate food, resulting in population emigration or death.
2. Harmful algal blooms produce a thick, green sludge that contaminates clean water and devalues recreational, commercial, and residential properties.

Option D:

1. Algal blooms can make it difficult for fish and other aquatic creatures to locate food, resulting in population emigration or death.

Final Answer: Eutrophication leads to the death of fish due to a decrease in $O_2$ content.