Which trio of water quality parameters indicates aquatic life support, acidity/alkalinity, and cloudiness?

• A. Dissolved oxygen indicates aquatic life support; pH indicates acidity/alkalinity; turbidity indicates cloudiness and suspended solids.
• B. Temperature indicates salinity; pH indicates taste; turbidity indicates color.
• C. Dissolved oxygen indicates color; pH indicates hardness; turbidity indicates odor.
• D. Turbidity indicates DO; pH indicates color; DO indicates taste.

Answer: (A)

The trio of indicators that best reflects aquatic life support, acidity/alkalinity, and cloudiness is dissolved oxygen, pH, and turbidity. Dissolved oxygen shows whether aquatic life can respire and survive, since fish and many invertebrates rely on it in the water. pH measures how acidic or basic the water is, which affects organism tolerance and the availability of nutrients and metals. Turbidity gauges how cloudy the water is, representing suspended solids that can reduce light penetration and scatter habitats.

Other groupings miss these direct associations. Temperature isn’t a direct measure of salinity, and while it influences life processes and oxygen levels, it doesn’t indicate salinity itself. pH isn’t about taste; its role is acidity/alkalinity. Turbidity is about cloudiness, not color. Dissolved oxygen isn’t a measure of color or taste.