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Due to which of the following organisms, yield of rice has been increased?

1. Anabaena
2. Bacillus popilliae
3. Sesbania
4. Bacillus polymyxa

Correct answer: Anabaena

Solution

Anabaena is a nitrogen-fixing cyanobacterium that enriches paddy fields by adding usable nitrogen to the soil, which boosts rice growth and yield. The other options are not the standard organism linked to increased rice yield in this context.

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