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Question

Farmers have reported 50% higher yield of rice by using which bio-fertilizer?

A
Azolla pinnata
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B
Legume - Rhizobium symbiosis
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C
Cyanobacteria
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D
Mycorrhiza
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Solution

The correct option is B Azolla pinnata
Azolla pinnata contains Anabaena azollae in its leaf cavities, which fixes atmospheric nitrogen and helpful in increasing nitrogen content in rice. Farmers have reported over 50% higher yields by using Azolla as a biofertilizer.
So, the correct answer is option A.

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