Topic: Biocontrol agents and biofertilizers· Biology and Human Welfare

Which one of the following produces nitrogen fixing nodules on the roots of Alnus ?

1. Beijernickia

2. Rhizobium

3. Frankia

4. Rhodospirillum

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

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Answer: 3. Frankia

Frankia is the actinomycete that forms nitrogen-fixing root nodules in non-leguminous plants such as Alnus. Rhizobium nodulates legumes, and Beijerinckia and Rhodospirillum are free-living nitrogen fixers.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which one of the following produces nitrogen fixing nodules on the roots of Alnus ?

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