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

1. Trees are very healthy 2. Trees are heavily infested
3. Location is highly polluted 4. Location is not polluted
Subtopic:  Lichens |
 87%
Level 1: 80%+

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The ‘photobiont’ [photosynthetic component] in a Lichen can be:

I. A green alga II. A cyanobacterium
 
1. Only I 2. Only II
3. Both I and II 4. Neither I nor II
Subtopic:  Lichens |
Level 3: 35%-60%

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