SAT Subject Biology Practice Question 137: Answer and Explanation

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Question: 137

7. Which of the following is considered a biotic factor capable of influencing a plant species's population growth?

I. Intraspecies competition

II. Predation

III. Nutrient availability

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

Correct Answer: D


A biotic factor is a living ecological influence that can shape a population's demographics. Intraspecific competition refers to competition between living organisms and thus is considered a biotic factor. Predation is the effect a living predator has on a prey species and is also considered a biotic factor. Nutrient availability refers to the nonliving materials an organism can gain from its environment and is considered an abiotic factor, making only I and II correct answers.

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