There exists a close association between the alga and the fungus within a lichen. The fungus:

Provides protection, anchorage and absorption for the alga

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Provides food for the alga

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Fixes the atmospheric nitrogen for the alga

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Releases oxygen for the alga

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Solution

The correct option is A Provides protection, anchorage and absorption for the alga
Lichens are symbiotic associations between fungus or mycobiont and an algal partner. Fungus forms the body of lichen as well as its attaching and absorbing mineral nutrients. Algae performs photosynthesis and provides food to the fungus.

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