Multiple choice

Lichens are found to be very sensitive to the levels of which of the following contaminants in the air?

  1. Carbon monoxide

  2. Ozone

  3. Nitrogen oxide

  4. Lead

  5. Sulphur dioxide
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer as lichens are found to be very sensitive to the levels of contaminants like sulphur dioxide in the air. In places where no lichens are growing, it is often a sign that the air is heavily polluted with sulphur dioxide.

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