It Has Been Hypothesized That Fungi and Plants Have a Mutualistic

question 4

Multiple Choice

It has been hypothesized that fungi and plants have a mutualistic relationship because fungi provide critical nitrogen for the plants' use. How do we know this happens?

• A) When plants are associated with fungi, they can fix atmospheric nitrogen that has been tagged with a radioactive label.
• B) Plants acquire more radioactive nitrogen when they are associated with fungi.
• C) Radioactively labeled sugars in plants eventually find their way to their symbiotic fungi.
• D) Radioactively labeled nitrogen shows up in fungi when they are symbiotic with plants.

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