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

1. provides protection, anchorage and absorption for the alga
2. provides food for the alga
3. fixes the atmospheric nitrogen for the alga
4. releases oxygen for the alga

Correct answer: provides protection, anchorage and absorption for the alga

Solution

In a lichen, the fungal partner (mycobiont) surrounds and supports the algal partner, helping it stay anchored and protected from drying out. It also aids in absorbing water and minerals, while the alga makes food by photosynthesis.

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