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How do lichens help chemical weathering of rocks?

Answer and explanation

Correct answer: They release organic acids

Direct answer: Option A, lichens release organic acids. Lichens are partnerships between a fungus and an alga or similar organism. They grow on bare rock and produce weak organic acids. These acids react with and slowly dissolve or weaken minerals, helping chemical weathering. Their attachment can also help open tiny spaces, but the key answer is acid release. Option B is wrong because lichens do not instantly freeze rocks. Option C is wrong because their role is not merely cleaning dust. Option D is wrong because they do not make rocks magnetic. This is biological activity causing chemical change, so it is a useful example of biological chemical weathering. Cue: lichen acids loosen minerals.

Related tags

Geomorphic ProcessesWeatheringLichens

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