Dwarf mistletoes are flowering plants that grow on certain forest trees. They obtain nutrients and water from the vascular tissu
es of the trees. The trees derive no known benefits from the dwarf mistletoes. Which of the following best describes the interactions between dwarf mistletoes and trees? A) mutualism B) parasitism C) commensalism D) facilitation E) competition
Commensalism is an interaction in which one organism benefits without causing any harm to the other. The other organism derives no benefit from the relationship.
The scenario above in which the dwarf mistletoe obtains nutrients from the vascular tissues of trees is a perfect example of such a relationship.
Parasitism is similar to this but the other organism is harmed in the process.
