Which statement best describes biological pollution?

• A. It involves living organisms such as pathogens that can cause disease.
• B. It is only about chemical toxins.
• C. It is about physical injuries.
• D. It has no health impact.

Answer: (A)

Biological pollution refers to contamination by living organisms that can cause disease or other health effects. It includes pathogens such as bacteria, viruses, fungi, and parasites, and these contaminants can enter water, air, food, or surfaces, leading to infections or allergic reactions. This makes the statement describing living organisms that can cause disease the best description of biological pollution. In contrast, chemical pollution involves toxic chemicals, physical injuries describe hazards from physical agents, and saying there is no health impact ignores real health risks from biological contaminants. Examples include waterborne bacteria causing gastroenteritis or mold spores triggering respiratory symptoms.