2. Which one of the following organisms can serve as a biofertilizer for rice crop?
Correct answer: A. Blue-green algae
- A. Blue-green algae
- B. Rhizobium sp.
- C. Mycorrhizal fungi
- D. None of these
Explanation
Blue-green algae, especially cyanobacteria such as Anabaena, can fix atmospheric nitrogen and enrich flooded rice fields. Rhizobium is also a nitrogen-fixing organism, but it mainly forms root nodules in legumes, not rice plants, so students may choose it by overgeneralizing nitrogen fixation.
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