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Question

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

A
Trees are very healthy
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B
Trees are heavily infested
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C
Location is highly polluted
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D
Location is not polluted
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Solution

The correct option is D Location is not polluted
Lichens are plants that grow in exposed places such as rocks or tree bark. Lichens are sensitive to sulphur dioxide and if the air is very badly polluted with sulphur dioxide there may be no lichens present, just green algae may be found. If the air is clean, shrubby, hairy and leafy lichens become abundant and indicate that the location is not polluted.

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