Mycorrhizae Are Symbiotic Associations Between Some Fungi and the Roots

Multiple Choice

Mycorrhizae are symbiotic associations between some fungi and the roots of many plants. Which of the following experiments best would test whether a plant benefits from the presence of the fungus?

A) Grow many individuals of Plant X with two different species of fungi. Then compare the average plant size and average number of seeds produced between the two groups.
B) Grow many individuals of Plant X and Plant Y without any fungus. Then compare the average plant size and average number of seeds produced between the two groups.
C) Grow many individuals of Plant X in shaded and unshaded conditions. Then compare the average plant size and average number of seeds produced between the two groups.
D) Grow many individuals of Plant X with and without its fungus. Then compare the average plant size and average number of seeds produced between the two groups.