By growing on the trunk or branch of a tree,a lichen gains height and exposure to sunlight for photosynthesis.The tree is not harmed by the lichen but does not benefit either.The relationship between the lichen and the tree is
A) commensalism.
B) mutualism.
C) parasitism.
D) interference competition.

Question

Quizplus · Accepted Answer

In commensalism, one organism benefits without harming or benefiting the other organism. In this case, the lichen benefits by gaining height and exposure to sunlight, but the tree is not harmed or benefited. Therefore, the relationship between the lichen and the tree is commensalism.

By Growing on the Trunk or Branch of a Tree,a