Which type of water pollution is described as odorless, tasteless, and colorless?

• A. Physical Water Pollution
• B. Ground Water Contamination
• C. Chemical Water Pollution
• D. Biological Water Pollution

Answer: (C)

The idea being tested is that some pollutants in water can’t be detected by our senses. When a pollutant is odorless, tasteless, and colorless, you wouldn’t notice it just by looking at the water or smelling it. Many chemical contaminants—like pesticides, fertilizers, heavy metals, or dissolved industrial chemicals—fit this description, so they can be present in water without any obvious clues and require proper testing to identify. That’s why chemical water pollution is the best fit for this description. Physical water pollution would be visible as sediment or debris, and biological pollution involves microorganisms and pathogens, which often have other telltale signs or health concerns rather than simply being undetectable by senses. Groundwater contamination is about where the pollution is located (in the groundwater) rather than the detectability of the pollutant itself.