7. Sulphur Dioxide pollution is indicated by an excessive growth of which of the following? A.Algal Blooms B.Lichens C.Bryophytes D.Protozoa
Answer: Option B Solution: If air is polluted with sulphur dioxide, then lichens will die in that particular environment. Since the era of industrialization, many species of lichens have gone extinct. Due to this property, lichens are considered to be the indicators of the air pollution.
