Question

Eutrophication leads to death of fish due to ______.

विकल्प

• increased O₂ concentration

• decreased O₂ concentration

• increased algal contents

• decreased algal contents

Answer 1

Eutrophication leads to death of fish due to decreased O₂ concentration.

Explanation:

BOD measures the amount of oxygen required by microorganisms to decompose organic matter in water. A decreased BOD means there is less organic pollution and thus more dissolved oxygen (O₂) available in the water. High oxygen content indicates better water quality and less microbial activity to consume oxygen. Conversely, a high BOD would indicate more organic pollution and higher microbial activity consuming oxygen.