Question

Lichens are symbiotic association between two organisms. Which of these statements about them is true?

• A. Lichens are fast growing organisms that live for a short period.
• B. The algal component is called mycobiont and fungal component is called phycobiont.
• C. They are pioneers of vegetation on rocks.
• D. They grow well in cities.

Answer 1

Answer: (C)

Lichens are symbiotic associations between algae and fungi. The autotrophic algal component is called phycobiont and the heterotrophic fungal component is called as mycobiont. Algae prepare food for fungi and fungi provide shelter and absorb mineral nutrients and water for its partner. Lichens are very good pollution indicators - they do not grow in polluted areas and in cities. Lichens are pioneers in the xerosere type of ecological succession on barren rocks.