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      Question

      Which of the following is considered an inappropriate medium for plant growth?

      A Vermiculite Correct Answer Incorrect Answer
      B Sand Correct Answer Incorrect Answer
      C Sphagnum moss Correct Answer Incorrect Answer
      D Concrete Correct Answer Incorrect Answer

      Solution

      Concrete is a solid, non-porous construction material that provides no room for roots or water. Growing media must be porous to allow for life-sustaining gas and water exchange.

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