NEET 2010 Biology question

The common nitrogen-fixer in paddy fields is

(1)AzospirillumCorrect
(2)Oscillatoria
(3)Frankia
(4)Rhizobium

Answer: (1)

Solution

The examination key for this item is Azospirillum. Azospirillum is a free-living, associative nitrogen-fixing bacterium that colonises the root zone (rhizosphere) of cereals including rice and is used as a biofertiliser for paddy, adding fixed nitrogen to the crop and reducing the need for nitrogen fertiliser. Hence

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Question ID VK-090644