Lichens can be used as:
1.  Bio-indicator for water and air pollution
2.  Initial vegetation for waste lands
3.  Source of wood
4.  To check the air pollution

Subtopic:  Lichens |
 56%
AIPMT - 1999
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There exists a close association between the alga and the fungus within a lichen. The fungus:
 

1. Provides food for the alga
2. Provides protection, anchorage, and absorption for the alga
3. Fixes the atmospheric nitrogen for the alga
4. Releases oxygen for the alga
Subtopic:  Lichens |
 82%
From NCERT
AIPMT - 2005
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh