SAT Subject Biology Practice Question 384: Answer and Explanation

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Question: 384

14. Algae that grows on the shell of a turtle; the turtle is not harmed

A. Predation
B. Commensalism
C. Interspecific competition
D. Mutualism
E. Parasitism

Correct Answer: B


B Because the turtle is not being harmed, eliminate choices that cause harm to one of the parties involved, such as choices A and E. Choice C may not directly cause harm to one of the species involved, but neither are the algae and turtle competing for anything; choice C can be eliminated. Eliminate choice D, because in mutualism both parties must benefit from the association, and while the algae may benefit, the turtle does not.

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