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Question
Which of the following biofertilizers is used by farmers to increase the yield of rice crop?
Options
Azotobacter
Azospirillum
Bacillus
Azolla
MCQ
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Solution
Azolla
Explanation:
Azolla is a small floating fern that houses nitrogen‑fixing cyanobacteria (Anabaena) in its leaf cavities; when used as a green manure or grown in rice paddies, it contributes usable nitrogen to the crop and improves rice yields, so it is widely used as a biofertilizer in paddy cultivation.
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