Biology for IGCSE & O level - Organisms And Their Environment (Section 2 - No. 30)
In the nitrogen cycle, what is the function of the bacteria in root nodules of plants?
To convert nitrates into nitrogen gas.
To convert nitrogen gas into a form usable by plants.
To convert ammonia into nitrates.
To break down dead organisms.
Explanation
These bacteria perform nitrogen fixation, making nitrogen available to plants.
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