When the Trunk or Limb of a Tree Provides the Substrate

Multiple Choice

When the trunk or limb of a tree provides the substrate on which an epiphytic orchid grows,the arrangement benefits the orchid,which gets nutrients from the air and moisture from aerial roots,while the tree is unaffected.The relationship is referred to as

A) amensalism.
B) commensalism.
C) competition.
D) parasitoidism.