Question

Assertion (A) Lichens act as pollution indicators.
Reason (R) These do not grow in areas that are polluted.

• A. If both A and R are true and R is the correct explanation of A
• B. If both A and R are true, but R is not the correct explanation of A
• C. If A is true, but R is false
• D. If A is false, but R is true

Answer 1

Answer: (A)

Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Lichens are good pollution indicators. These do not grow in areas that are polluted because these organisms are sensitive to $SO_2$ gas present in polluted areas up to great concentration.