Lichens are the symbiotic association with of algae and fungi
a) What is symbiosis?
b) State the economic importance of lichens?

a) Symbiosis is the phenomenon by which two organisms maintain relationship with each other to be mutually benefitted. In symbiotic mode, organisms develop a special relationship with certain other organisms to obtain nourishment. Organisms involved in this type of relationship are called as symbionts.

b)  Lichens are the organisms that are formed by the association of the filamentous fungus and the microscopic green algae or cyanobacteria.

Significance of lichens are:

 

  • Usnic acid, a very active lichen substance is used in pharmaceutical preparations.
  • Some lichens are processed in the perfume industry.
  • Some lichens are sensitive reagents for the evaluation of air pollution.

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