18. Which of the following is incorrect for lichens? * a. They are an example of symbiotic association b. Algal component of lichens is known as mycobiont c. They grow well in polluted areas O d. They are very good pollution indicators.
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Answer:
option b and c
Explanation:
The algal component of lichen is called phycobiont and fungal component of lichen is called mycobiont.
Lichens grow in all environment Except high seas and highly polluted area because lichens are sensitive to atmospheric pollution because they receive all the nutrients and water from the atmosphere.
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The incorrect statement is both b and c.
- These organisms do not grow well in polluted areas and their algal component is called phycobiont
- They do not maintain roots and rely on the atmosphere for all of their nutrition. Thus, they require an unpolluted and healthy environment.
- As they get their essential food and water from air deposition, they are more vulnerable to potential pollutants and can easily fall out.
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