SAT Subject Biology Practice Question 236: Answer and Explanation

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Question: 236

6. Semelparous species produce a large number of offspring once in their life spans. Iteroparous species produce a small number of offspring repeatedly throughout their lives. Which ecological condition will most likely select for a semelparous strategy?

A. A surplus of nutrients or food sources
B. A lack of competition from other species
C. The availability of multiple ecological niches
D. Persistent limiting factors in the environment
E. A lack of consistency of environmental conditions

Correct Answer: E


A lack of consistency in environmental conditions will favor semelparity. The offspring's genetic variation ensures that at least some will survive the changing conditions.

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