Question

Write a note on lichens.

Answer 1

Lichens:

1. These are heterotrophic eukaryotic organisms.
2. Symbiotic relationship is when fungal species live in permanent mutual relationships with blue-green algae (or cyanobacteria).
3. These symbiotic life forms are called lichens.
4. A lichen is not a single organism but a symbiosis among different organisms like fungus and a cyanobacterium or algae.
5. Lichens are slow-growing large colored patches on the bark of trees.

Uses of lichen:

1. Lichens produce pigments and other secondary compounds that can be used as dyes.
2. Lichens are sensitive to atmospheric pollutants like sulfur and nitrogen.
3. Air pollution leads to a decline in the lichen population and thus, they can be used as indicator organisms.