SAT Subject Biology Practice Question 371: Answer and Explanation

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Question: 371

1. Permits gas exchange and transpiration in leaves

A. Hair
B. Epidermis
C. Cuticle
D. Guard cell
E. Sweat gland

Correct Answer: D


D The guard cells are found near the openings in the leaf called stomates. Stomates allow gas exchange to occur (notably oxygen and carbon dioxide), and while they are open water leaves through transpiration. You should have immediately eliminated choices A and E, because they are not leaf structures.

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