Which outcome results when a legume has mutated *nif* genes?

💡 Explanation

Lack of functional *nif* genes prevents nitrogen fixation via *Rhizobium*-induced bacteroid differentiation; because nodule formation must precede nitrogen fixation by bacteroids, non-functional *nif* leads to root nodule absence, therefore A, rather than altered carbon exudates, phosphate use, or photosynthesis.

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