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Nitrogen-fixing bacteria are most commonly found in the root nodules of:

ALegumes
BCereals
CGrasses
DConifers
Answer & Solution
Correct answer: A. Legumes
1. Legumes give us pulses. 2. Their root nodules hold nitrogen fixers. 3. Lightning is the only other natural fixer. _Source: syllabus Science, Chapter 14, Natural Resources._
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