Practice question
Question
Symbiotic nitrogen fixation. in legume nodules involves complex interaction between Rhizobium and legume roots. This complex interaction is governed by A. Integration of sym plasmid of Rhizobium in the root nuclear genome. B. Sensing of plant flavonoids by rhizobia. C. Activation of nod genes in rhizobia. D. Activation of NODULIN genes in legume roots. Which one of the following combinations is correct?
Explanation
Rhizobium nitrogenase is extremely O₂-sensitive, so free-living aerobic culture cannot fix N₂. Leghemoglobin, bacteroid differentiation and host-specific nodulation occur only inside legume nodules. Pea isolate fails to nodulate soybean, liquid culture is not pink.
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