Which of the following is an example of biological pollution?

• A. Algae blooms in water
• B. Living organisms that can cause disease, such as pathogens from fecal contamination.
• C. Radioactive particles
• D. Noise pollution

Answer: (B)

Biological pollution involves contamination by living organisms or their products that threaten health or ecosystems. The clearest example is living organisms that can cause disease, such as pathogens from fecal contamination. When sewage or fecal matter enters water or food, disease-causing microbes like bacteria, viruses, or parasites can be transmitted to people or animals, leading to illness. These are classic biological pollutants because they are biological agents directly linked to health risks.

Radioactive particles are a radiological hazard, not biological. Noise pollution is a physical/acoustic intrusion and not a biological agent. Algae blooms can be a biological concern and may produce toxins, but the most direct and widely recognized example of biological pollution in terms of health risk is pathogens from fecal contamination.