Nitrogen fixation by legumes is carried out by bacteria of the genus Rhizobium that a. oxidize nitrogen from the atmosphere b. reduce carbon dioxide from the air c. oxidize both CO2 and N2 molecules from the air d. reduce N2 from the atmosphere e. transform CO2 into glucose
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Step 1: Rhizobium bacteria attach to the roots of legume plants. Show more…
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How do nitrogen-fixing bacteria in the soil contribute to the nitrogen cycle? a. They return nitrogen to the atmosphere. b. They change ammonium to nitrate. c. They change nitrogen to ammonium. d. They withdraw nitrate from the soil. e. They decompose and return nitrogen to autotrophs.
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Nitrifying bacteria participate in the nitrogen cycle mainly by a. converting nitrogen gas to ammonia. b. releasing ammonium from organic compounds, thus returning it to the soil. c. converting ammonium to nitrate, which plants absorb. d. incorporating nitrogen into amino acids and organic compounds.
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