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A mycorrhiza is an association between a fungus and

  • A.A plant root
  • B.A nitrogen-fixing bacterium
  • C.An alga
  • D.A soil arthropod

Answer: A

Correct answer: A plant root

A mycorrhiza is the symbiosis between a fungus and a plant root, and it is the normal condition for the great majority of land plants rather than an exception. The fungal hyphae extend far beyond the root hairs and supply phosphorus and water the root could not reach, receiving photosynthate in return. An association between a fungus and an alga is a lichen, which is a different partnership entirely.

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