Biology for IGCSE & O level - Organisms And Their Environment (Section 4 - No. 14)
Which of the following statements correctly describe the role of nitrogen-fixing bacteria?
They convert atmospheric nitrogen into forms usable by plants.
They are found in the roots of legumes.
They convert ammonia into nitrates.
They release nitrogen gas back into the atmosphere.
Explanation
Nitrogen-fixing bacteria convert atmospheric nitrogen into a form plants can use, often residing in legume root nodules. They do not convert ammonia to nitrates; that is done by nitrifying bacteria.
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