SAT Subject Biology Practice Question 141: Answer and Explanation

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Question: 141

11. Plants that inhabit warm, dry environments have evolved which of the following adaptations?

I. Conversion of carbon dioxide to a four-carbon compound

II. Stomata that remain closed throughout the night

III. Photorespiration

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

Correct Answer: A


Plants that inhabit arid environments have adaptations that prevent photorespiration and allow them to close their stomata during the day, preventing the loss of water. One adaptation, found in C4 and CAM plants, converts carbon dioxide to a four-carbon compound as a preliminary step to photosynthesis.

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