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.

• Which risk increases when a bony fish migrates rapidly between fresh, saltwater regions?
• Which limitation of legume growth in nitrogen-poor soils is commonly overcome as result of bacteroid nodule symbioses?
• Which outcome results when freshwater fish experience internal salt dilution?
• Which physiological challenge increases for freshwater fish adapted to rapid salinity increases?
• Which mechanical risk escalates when a bird's posterior air sacs fail to fully inflate during flight?
• Which developmental outcome typically occurs in insect larvae if corpora allata activity is prematurely terminated?