Select the mismatch :(1) Rhodospirillum - Mycorrhiza(2) Anabaena - Nitrogen fixer(3) Rhizobium - Alfalfa(4) Frankia - Alnus

1. Rhodospirillum - Mycorrhiza

2. Anabaena - Nitrogen fixer

3. Rhizobium - Alfalfa

4. Frankia - Alnus

Doubtly Asked 30 Oct 2026 NEET UG 2017 Practice test neet Save WhatsApp Report

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Answer: 1. Rhodospirillum - Mycorrhiza

Key idea: Match each microbe with its true role.

Rhodospirillum is a photosynthetic purple bacterium (a free-living nitrogen fixer), not a mycorrhiza. Mycorrhiza is a fungus-root association such as Glomus. This pair is the mismatch.
Anabaena: cyanobacterium, fixes nitrogen.
Rhizobium: root nodules of legumes such as alfalfa.
Frankia: nodules of non-legume Alnus.

Answer: (1).

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

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