Assertion :Lichens are widely used as environmental indicators or bio-indicators. Reason: Lichens derive their water and essential nutrients mainly from the atmosphere rather than from the soil.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Lichens are a complex life form that is a symbiotic partnership of a fungus and an alga.
If air is very badly polluted with sulfur dioxide there may be no lichens present.
Lichens are widely used as environmental indicators or bio-indicators because lichens derive their water and essential nutrients mainly from the atmosphere rather than from the soil. If the air contains a high concentration of sulfur dioxide it results in the death of lichens.
Hence ''Both Assertion and Reason are correct and Reason is the correct explanation for Assertion''.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion''.

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