Question

What role do bio-indicators play in assessing aquatic pollution levels?

• A. They are used for chemical analysis of water samples
• B. They indicate the presence of specific pollutants based on their health status
• C. They control nutrient inputs in aquatic ecosystems
• D. They are not related to aquatic pollution assessment

Hint:

Think of bio-indicators as living ecological sensors. They do not perform chemical tests themselves, but their health status reveals the actual impact of pollutants.

Answer 1

The Correct Option is B