alleryA factory's smoke changes the air in an unwanted way. Anything causing such a change is a:
APollutant
BNutrient
CCatalyst
DFertiliser
Answer & Solution
Correct answer: A. Pollutant
1. Pollution is any undesirable change in air, land, water or soil.
2. The agent that brings the change has a name.
3. It is a pollutant.
_Source: syllabus Biology, Chapter 16, Environmental Issues._
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