Why are lichens a good indicator of environmental quality?
A) They cannot absorb toxins.
B) If the air is polluted they cannot get enough sunlight for photosynthesis.
C) They cannot excrete absorbed toxins.
D) If the soil is polluted they cannot produce roots.
E) Toxins inhibit their reproduction.

Question

Quizplus · Accepted Answer

Because lichens cannot secrete toxins and they are very good at absorbing, any environmental toxins will be readily absorbed, killing the lichen.

Why Are Lichens a Good Indicator of Environmental Quality