Question

Lichens are ecologically important as they

• A. Purify air
• B. Are pioneers of barren rocks
• C. Are symbionts of algae and fungi
• D. Are associated with mycorrhizal roots

Answer 1

The correct option is B Are pioneers of barren rocks

Lichens are symbionts of algae and fungi. They can grow on barren rocks as they can separate minerals by eroding rocks. They form beds which are rich in the organic matter after their death and dissolution. Thus other plants can eventually grow in these beds of organic matters. Lichens also contribute to soil formation by entrapping water, dust etc.

Hence, option B is correct.