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In the legume and rhizobia symbiosis, what does each partner obtain?
AThe plant gains ammonia, the bacteria gain carbon compounds
BThe plant gains phosphate, the bacteria gain carbon compounds
CThe plant gains ammonia, the bacteria gain nitrate from soil
DThe plant gains phosphate, the bacteria gain nitrate from soil
Answer & Solution
Correct answer: A. The plant gains ammonia, the bacteria gain carbon compounds
1. In any symbiosis both organisms benefit, so the exchange has two directions.
2. The plant obtains ammonia from the fixation carried out in its nodules.
3. The bacteria obtain carbon compounds generated through photosynthesis.
4. They also obtain a protected niche in which to grow, which the nodule provides.
5. Phosphate is the mineral a plant gains from a mycorrhizal fungus, not from rhizobia, so that word marks the wrong partnership.
6. Nitrate from soil is not what the bacteria take, since the whole point is that they draw nitrogen from the air.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 31 "Soil and Plant Nutrition", section 31.3 Nutritional Adaptations of Plants_
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