Which Statement About Mycorrhizal Relationships Is False

Which statement about mycorrhizal relationships is false?

A) Arbuscules are the sites of nutrient exchange in the mycorrhizal relationship.
B) Arbuscular mycorrhizae represent the most common mutual relationship between plant roots and fungi.
C) Plant roots send signals to soil-borne fungi and those fungi in turn send signals to the roots.
D) The cytoplasm of the plant and fungal cells do not come into contact.
E) Plant roots form mycorrhizal relationships to fend off infection by harmful fungi.