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In an ectomycorrhiza the fungal hyphae

  • A.Remain entirely outside the root with no contact
  • B.Grow between root cortical cells without penetrating them
  • C.Penetrate the cortical cells and form arbuscules inside
  • D.Grow only inside the vascular cylinder of the root

Answer: B

An ectomycorrhiza forms a sheath around the root and a Hartig net that threads BETWEEN cortical cells, with no penetration of the cells themselves. Penetrating the cell to form arbuscules is the defining feature of the arbuscular type instead.

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