NDA 2020 GAT · General Knowledge · Ecology and Environment · medium

Nitrogen-fixing bacteria living in the root nodules of leguminous plants belong to the genus

Single correct option

A. Azolla
B. Nostoc
C. Lactobacillus
D. Rhizobium

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Answer: (D) Rhizobium

Rhizobium lives in symbiosis in the root nodules of pulses and converts atmospheric nitrogen to ammonia usable by the plant, enriching soil. Nostoc is a free-living cyanobacterium and Azolla is a water fern that hosts cyanobacteria. Lactobacillus turns milk into curd.

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