The association in which one is Lianas and other is trees is commensalism.
The Lianas plant has long, flexible stem, it gets the support of the tree without affecting harming or providing any benefit to the tree.
With the help of the tree, the Lianas are able to expose its leaves to the sunlight.
Thus, the association of Lianas and tree represent commensalism that is one species is benefitted and the other is neither benefitted nor harmed
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