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      Question

      What does the rhizosphere: soil (R:S) ratio

      quantify?
      A Microbial populations in the rhizosphere Correct Answer Incorrect Answer
      B Nitrogen fixation rates Correct Answer Incorrect Answer
      C Soil pH changes Correct Answer Incorrect Answer
      D Plant root growth Correct Answer Incorrect Answer

      Solution

      Explanation: The rhizosphere: soil (R:S) ratio is used to quantify the difference in microbial populations between the rhizosphere and non-rhizosphere soils.

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