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      Question

      The criteria of essentiality was given by

      ………………. And it was redefined by………………
      A Liebig, Stout Correct Answer Incorrect Answer
      B Anon and Stout, Stout Correct Answer Incorrect Answer
      C Arnon and Stout, Arnon Correct Answer Incorrect Answer
      D Schofield, Liebig Correct Answer Incorrect Answer
      E Sorenson, Schofield Correct Answer Incorrect Answer

      Solution

      Criteria of essentiality given by Arnon and Stout and it was redefined by Arnon in 1954. A plant cannot complete its life-cycle in the absence of the element. The action of the element must be specific, with no other element being able to completely substitute for it. The element must be shown to be directly involved in the nutrition of the plant.

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