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A healthy, actively fixing legume nodule when cut open appears

  • A.Bright green inside
  • B.Black and hollow
  • C.Pink or red inside
  • D.Chalky white inside

Answer: C

The pink or red interior is leghaemoglobin, so its presence is the standard field check that a nodule is actually fixing nitrogen. A white or green interior indicates a nodule that has formed but is not effective, and a blackened one is senescent.

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