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A good green manure in rice fields is:

1. (a) Aspergillus
2. (b) Azolla
3. (c) Salvinia
4. (d) Mucor

Correct answer: (b) Azolla

Solution

Azolla is a floating aquatic fern that forms a symbiotic association with nitrogen-fixing Anabaena, so it adds nitrogen to paddy fields. That makes it a well-known green manure for rice cultivation.

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