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The term rhizoplane refers to

  • A.The zone of soil whose chemistry is altered by root exudates
  • B.The horizontal plane at which root branching is most dense
  • C.The interface at which topsoil gives way to subsoil
  • D.The root surface together with closely adhering soil particles

Answer: D

The rhizoplane is the root surface itself, along with the soil that clings to it, and it carries an even denser microbial film than the surrounding rhizosphere. Distinguishing the two matters when a method requires washing the root, which removes rhizosphere soil but leaves the rhizoplane community.

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