Why is turbidity bad for aquatic ecosystems?

• A. It increases dissolved oxygen
• B. It neutralizes acidity and stabilizes temperatures
• C. It reduces sunlight, slows photosynthesis, clogs fish gills, and can warm the water
• D. It stops algal growth entirely

Answer: (C)

Turbidity is the cloudiness of water caused by suspended particles. When water is hazy, those particles block and scatter sunlight, which reduces the light that submerged plants and algae receive. That limits photosynthesis, lowering oxygen production and altering energy flow in the ecosystem. The particles can also physically irritate or clog fish gills, making it harder for them to extract oxygen. Additionally, suspended matter tends to absorb heat, warming the water and reducing dissolved oxygen further. This combination—less light for photosynthesis, potential gill clogging, and added warmth—explains why turbidity is harmful to aquatic life. The other choices don’t fit: turbidity isn’t linked to higher dissolved oxygen or to neutralizing acidity or stabilizing temperature, and it doesn’t completely stop algal growth (it mostly reduces it by shading, but doesn’t halt it outright).