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Rhizobium forms a mutualistic relationship to fix nitrogen, Streptomyces produces streptomycin, and Spirulina is abundant in vitamin B1 and proteins.

1. The statement is accurate.
2. The statement is inaccurate.
3. The statement is partly true.
4. None of these apply.

Correct answer: The statement is partly true.

Solution

The statement is partially correct because Rhizobium is indeed a symbiotic nitrogen-fixing bacterium, and Streptomyces is a source of streptomycin. However, Spirulina is a rich source of proteins and vitamin B12, not vitamin B1.

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