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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 trees’ roots, similar to legume-In soils.

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