Multiple choice

Less appearance of lichens is observed on the sides of trees facing the roads as compared to the ones away from the roads. This can be explained as lichens are sensitive to

  1. noise pollutants

  2. water pollutants

  3. air pollutants

  4. soil pollutants

  5. _

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is found in the air anywhere - outdoors and indoors.