alleryStart learning →Soil bacteria that form nodules on legume roots are collectively called what?
AThe mycorrhizae
BThe rhizobia
CThe cyanobacteria
DThe saprophytes
Answer & Solution
Correct answer: B. The rhizobia
1. The most important source of biological nitrogen fixation is the partnership between soil bacteria and legumes.
2. Those soil bacteria are collectively called rhizobia.
3. They interact symbiotically with legume roots to form specialised structures called nodules, where fixation happens.
4. Mycorrhizae are fungal partnerships with roots and saprophytes are plants that live on dead matter, so neither fixes nitrogen in nodules.
_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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