Which metabolic tradeoff do leguminous plants experience when initiating symbiotic nitrogen fixation?

💡 Explanation

Legumes allocate fixed carbon to rhizobia in root nodules to fuel nitrogen fixation, but this process decreases carbon available for photosynthesis, because the energetic demands of nitrogenase outweigh the direct benefits to plant growth; therefore reduced photosynthetic carbon gain, rather than other stress adaptations.

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