SAT Subject Biology Practice Question 140: Answer and Explanation

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Question: 140

10. Nitrogen-fixing bacteria are most likely found in which environment?

A. Stomach of a reptile
B. Lower epidermis of leaves
C. Gills of freshwater fish
D. Large intestine of humans
E. Root systems of plants

Correct Answer: E


A common mutualism between plants and bacteria occurs in root systems, which host microorganisms that make limiting nutrients, such as nitrogen, available to the plants.

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