NEET 2000 Biology question

Which aquatic fern is used to increase the yield in paddy crop :

(1)AzollaCorrect
(2)Salvinia
(3)Marsilea
(4)Isoetes

Answer: (1)

Solution

Azolla, a small free-floating aquatic fern, has a symbiotic nitrogen-fixing cyanobacterium (Anabaena azollae) in its leaf cavities. It is used as a biofertiliser in paddy fields to add

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Question ID VK-088696