Environment And Road Safety Education And Violence Against Women And Children And Drug Abuse 2021 Exam With Answers

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31.

Which one of the following is useful biological indicator of SO₂ pollution?

A: Pseudomonas

B: Algal blooms

C: Lichens

D: Bryophytes

The answer is: C

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Explanation

The correct answer is Lichen. Due to the sensitivity of Lichens to sulphur dioxide, it is very useful as a biological indicator of Sulphur-dioxide pollution.