Which type of relationship exists between the algae and fungi that form lichen

Mutualism type of relationship exists between the algae and fungi that form lichen.

Explanation:

In algae and fungi, Mutualism type of symbiosis is present. In Mutualism, both the organisms that is algae and fungi gets benefits from each other. Fungi absorb water and nutrients from the environment and supply these nutrients to the algae. Algae produce food materials and provide it to fungi.