Mutualism : Both the species benefit in mutualism. E.g. Lichen – algae and fungi Mycorrhizae : Fungi and roots of higher plants (pinus roots).

Commensalism : The interaction where one species is benefitted and the other is neither benefitted nor harmed is called commensalism E.g. Orchid growing as epiphyte on branch of a tree; barnacles growing on the back of the whale.