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NEET 2026 (Phase 1) · BiologyPrevious Year Question

Among the following pairs of microbes, which pair has both the microbes that can be used as biofertilizers?

Answer: (C) Cyanobacteria and Rhizobium. Answer: (3) Cyanobacteria and Rhizobium Solution: Rhizobium fixes atmospheric nitrogen symbiotically in legume root nodules, and cyanobacteria (Anabaena, Nostoc, Oscillatoria) fix nitrogen and serve as biofertilisers in paddy fields.

  1. A.Aspergillus and Rhizopus
  2. B.Rhizobium and Rhizopus
  3. C.Cyanobacteria and Rhizobium✓
  4. D.Aspergillus and Cyanobacteria

Correct Answer

(C) Cyanobacteria and Rhizobium

Solution & Explanation

Answer: (3) Cyanobacteria and Rhizobium Solution: Rhizobium fixes atmospheric nitrogen symbiotically in legume root nodules, and cyanobacteria (Anabaena, Nostoc, Oscillatoria) fix nitrogen and serve as biofertilisers in paddy fields. Aspergillus and Rhizopus are not biofertilisers, so only option (3) has both members as biofertilisers. NCERT Reference: Ch 8, p.158, line 23 — "Cyanobacteria are autotrophic microbes widely distributed in aquatic"

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