First slide

Viruses, Viroids,Prions and Lichens

Question

A location with luxuriant growth of lichens on the trees indicates that the

Easy

A

Trees are very healthy
B

Trees are heavily infested
C

Location is highly polluted
D

Location is not polluted

Solution

Lichens are symbiotic associations between algae and fungi. Lichens are very good pollution indicators – they do not grow in polluted areas.

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