Which of these plants contains nitrogen-fixing bacteria?

Gram

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Wheat

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Mustard

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Cotton

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Solution

The correct option is A Gram
There is two type of nitrogen-fixing bacteria one is free-living and another is symbiotic. Rhizobium is the symbiotic bacteria that lives in root nodules of leguminous plants e.g., grams. Rhizobium fixes the atmospheric nitrogen in plants in the usable form. Thus, the correct answer is option A.

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