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B
Caesalpinidoeae
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C
Papilionideae
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D
Solanaceae
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Solution
The correct option is A Papilionideae Root nodules or swellings are found on the roots of plants in subfamily Papiliodnideae of family Fabaceae or Leguminosae (e.g., pea, gram). These nodules contain symbiotic nitrogen-fixing bacteria which convert nitrogen gas from the atmosphere into ammonia. This process is called as nitrogen fixation.