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      Question

      A common example of a symbiotic non-legume

      nitrogen-fixing association is:
      A Corn and Azospirillum Correct Answer Incorrect Answer
      B Rice and Pseudomonas fluorescens Correct Answer Incorrect Answer
      C Casuarina and Frankia Correct Answer Incorrect Answer
      D Wheat and mycorrhizae Correct Answer Incorrect Answer
      E Sunflower and Rhizobium Correct Answer Incorrect Answer

      Solution

      Casuarina species form symbiotic relationships with Frankia bacteria, which fix atmospheric nitrogen in nodules on the treesтАЩ roots, similar to legume-In soils.

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