SAT Subject Biology Practice Question 146: Answer and Explanation

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Question: 146

16. Ecologists measured the evapotranspiration and net primary production of different ecosystem types. Their results are shown in the graph.

According to the chart, which best describes the relationship between solar energy and net primary production?

A. Solar energy is unrelated to net primary production.
B. Solar energy is positively correlated with net primary production.
C. Solar energy is negatively correlated with net primary production.
D. Solar energy increases net primary production where water is not limited.
E. Solar energy increases net primary production by increasing evapotranspiration.

Correct Answer: D

Explanation:

Solar energy increases net primary production but cannot do so unless water is available for use in photosynthesis. Therefore, deserts have lower rates of primary production than tropical rain forests.

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