SAT Subject Biology Practice Question 450: Answer and Explanation

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Question: 450

20. Questions below wrefers to the following data obtained for a rabbit population over a period of several years.

YearNumber of rabbits

Ultimately, the amount of nutrients and other resources would become limiting. What would happen to the rabbit population at that time?

I. It would reach the carrying capacity of the environment.

II. It would continue to grow indefinitely.

III. It would engage in intraspecific competition.

A. I only
B. II only
C. I and II only
D. I and III only
E. I, II, and III

Correct Answer: D


D This is a I, II, III-style question, so remember to eliminate answer choices as you work through the options. If the nutrients and other resources are "limiting," they will limit the population size and it will reach the "carrying capacity" of the environment. Option I is therefore true, and choice B can be eliminated. Option II directly contradicts option I; if option I is true, then option II must be false; choices C and E can be eliminated. Option III is also true. If nutrients and other resources are limited, the rabbits will compete with one another (intraspecific competition) for these limited nutrients; choice A can be eliminated. The stronger rabbits will survive, the weaker will die off, and the population will stabilize at its carrying capacity.

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