We find that $Rhizobium$ forms nodules on the roots of leguminous plants. Also,$Frankia$,another microbe,forms nitrogen-fixing nodules on the roots of the non-leguminous plant $Alnus$. What kind of relationship is observed between mycorrhiza and pine trees?

  • A
    Parasitic
  • B
    Symbiotic
  • C
    Commensalism
  • D
    Amensalism

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Identify the $A$ to $D$ correctly in the given diagram of root nodule development and choose the correct option accordingly.

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In which of the following angiosperms do the root nodules contain filamentous nitrogen-fixing microorganisms?

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