A lichen is growing on a tree trunk. The 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 this relationship, the lichen benefits by gaining height and exposure to sunlight for photosynthesis, but the tree is not harmed or benefited by the lichen. Therefore, it is an example of commensalism.

A Lichen Is Growing on a Tree Trunk