SAT Subject Biology Practice Question 245: Answer and Explanation

Next steps

Question: 245

15. Which statement BEST describes the Allee effect?

A. Population growth increases as population density increases, below a certain density.
B. Population growth increases as population density increases, above a certain density.
C. Population growth decreases as population density increases, above a certain density.
D. Population growth increases as population density increases, causing density to then decrease.
E. Population growth decreases as population density increases, causing density to then decrease.

Correct Answer: A

Explanation:

The Allee effect occurs when population are at low densities, and growth rate is low because individuals have difficulty locating mates. As a result, population growth is positively correlated with population density.

Previous       Next