Mention four industrial importance of lichens.

1.	Mention four industrial importance of lichens.
Answer» \tLichen, especially crustaceous lichens erode rocks and convert them in to soil. After their death, thallus dissolves and form organic matter, which mix these rock minerals with salts and make the soil suitable so that other plants can grow.\tMicrobial dosages of Sulphur dioxide pave a side effect on their growth. Therefore, they are good indicators of air pollution and become extinct in the polluted areas.\t\xa0Some lichens like stone mushrooms are used as a food.\t\xa0Lichen and other chemical substances present in it are also used as medicines.\t\xa0Do you know that perfumes are also made from lichens; such as from Ramalina lichen.

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