Which of the Following Statements Is Not True About Mycorrhizae

Which of the following statements is not true about mycorrhizae?

A) Ectomycorrhizae form a dense sheet over the plant root.
B) Arbuscular mycorrhizae penetrate cell walls of the root cortex.
C) Roots can form a mycorrhizal symbiotic relationship with all species of fungi.
D) Fungi and bacteria can interact in ways that help plants respond to stress.
E) Treating seeds with mycorrhizal fungi can improve crop yield.