It Has Been Hypothesized That Fungi and Plants Have a Mutualistic

question 17

Multiple Choice

It has been hypothesized that fungi and plants have a mutualistic relationship because plants make sugars available for the fungi's use. What is the best evidence in support of this hypothesis?

• A) Fungi survive better when they are associated with plants.
• B) Radioactively labeled sugars produced by plants eventually show up in the fungi with which they are associated.
• C) Fungi associated with plants have the ability to undergo photosynthesis and produce their own sugars, whereas those not associated with plants do not produce their own sugars.
• D) Radioactive labeling experiments show that plants pass crucial raw materials to the fungus for manufacturing sugars.

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