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A location with luxuriant growth of lichens on the trees indicates that the:
Option: 1
Trees are very healthy
Option: 2
Trees are heavily infested
Option: 3
Location is highly polluted
Option: 4
Location is not polluted.
Answers (1)
Lichen
- A lichen is a symbiotic association between algae and fungi.
- The algal component is called phycobiont and it provides food to the fungal component.
- The fungal component is called mycobiont and it provides shelter, protection, water & minerals to the algal part.
- Lichens grow in a variety of areas like barren rocks, moist habitats, tree bark, window panes etc.
- Lichens are of following types:
- 1. Crustose- crust like e.g. Graphis, Rhizocarpon etc.
- 2. Foliose- The body of a lichen is leaflike, flat, broad, lobed and leaf-like. E.g. Parmelia.
- 3. Fruticose- Branched like a bush. e.g Usnea, Cladonia
- 4. Squamulose - tightly clustered and slightly flattened pebble-like units.
- Lichens are good pollution indicators.
- Lichen such as Roccella tinctoria is used to obtain biological stain orcein and it is also a source of litmus.
Luxuriant lichen growth indicates nonpolluted environment.
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