SAT Subject Biology Practice Question 289: Answer and Explanation

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Question: 289

19. All of the following could be considered density-dependent factors affecting population growth EXCEPT

A. limited nutrients
B. climate temperature
C. build-up of toxins
D. predation
E. limited water

Correct Answer: B


B Density-dependent factors are those that get more significant as the size of the population increases. Limited nutrients and water, toxic waste build-up, and predation are all issues that are of greater concern to a large population than to a small one. Only choice B, climate temperature, is not more worrisome to a large group than to a small one. It will affect all populations equally, regardless of their size. Remember your LEAST/ EXCEPT/NOT technique.

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