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The rhizosphere is best defined as

  • A.The zone of soil immediately surrounding and influenced by plant roots
  • B.The surface film of the root itself and nothing beyond it
  • C.The layer of decaying leaf litter lying on top of the mineral soil horizon
  • D.The permanently water-saturated zone below the water table

Answer: A

The rhizosphere is the narrow region of soil whose chemistry and biology are altered by the root, chiefly through exudates of sugars, amino acids and organic acids. The root SURFACE is distinguished as the rhizoplane, and the litter layer and the saturated zone are unrelated to root influence.

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