Practice!

Sample Problem

Which of the following is an example of a parasite?

Solution

(C) is the correct answer. A mosquito feeding off the blood of deer is sucking nutrients out of the deer’s body. (A) and (D) are both commensal relationships. The fact that they are not drawing nutrients from the body should automatically tip you off. (B) you should recognize as a mutualistic relationship between the flower and the bee. The bee drinks nectar from the flower and helps the flower cross-pollinate. The flower does not depend on its nectar for nutrition.