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The main nutritional benefit a mycorrhiza gives its host plant is improved uptake of

  • A.Sodium
  • B.Phosphorus
  • C.Nitrogen gas
  • D.Potassium only

Answer: B

Phosphate moves very slowly through soil, so a root quickly exhausts the supply immediately around it; fungal hyphae are thin enough to explore far beyond that zone and deliver phosphorus back. Mycorrhizas do not fix nitrogen, which is the work of bacteria.

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