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Name the water fern that is an excellent...

Name the water fern that is an excellent biofertiliser for rice cultivation.

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**Step-by-Step Solution:** 1. **Identify the Type of Plant**: The question asks for a water fern that acts as a biofertilizer. We need to focus on aquatic ferns that are known for their role in agriculture. 2. **Research Known Biofertilizers**: Among the various aquatic ferns, we should look for those specifically used in rice cultivation. Biofertilizers are organisms that enhance the nutrient quality of the soil. 3. **Recognize Azolla**: The water fern that is widely recognized for its biofertilizing properties in rice cultivation is Azolla. ...
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