Question

Which one of the following is best indicator of SO₂?

• A. Algae
• B. Lichen
• C. Bryophytes
• D. Pteridophyte

Answer 1

The correct option is B

Lichen

The correct option is B.

Explanation of correct option:

Option B

1. Bioindicators are used to monitor the protection of the natural environment in the surroundings.
2. Lichens are the most accurate indicators of sulfur dioxide in the atmosphere.
3. Sulfur dioxide dissolves in rainwater, causing lichen damage and preventing it from growing.

Explanation of incorrect options:

Option A

1. Algae respond quickly to water disturbances.

Option C

1. Bryophytes are bio indicators of water pollution.

Option D

1. Pteridophytes are a positive indicator of forest integrity.

Final answer: Lichens are the best indicator of SO_2.