SAT Subject Biology Practice Question 233: Answer and Explanation

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Question: 233

3. Which of the following remove nitrogen from the atmosphere?

I. Denitrifying bacteria

II. Industrial fertilizer production

III. Lightning

IV. Nitrogen-fixing bacteria

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

Correct Answer: D

Explanation:

Industrial fertilizer production, lightning, and nitrogen fixation by soil bacteria all convert atmospheric nitrogen gas to nitrogen compounds. Denitrifying bacteria return nitrogen compounds in the soil to the atmosphere.

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