Which of the following is incorrect statement?

  1. An analysis of xylem exudate suggests that some of the nitrogen travels as inorganic ions and much of it is carried in the organic form as amino acids
  2. Small amount of P and S is also carried as inorganic compounds in xylem exudate
  3. There is exchange of material between xylem and phloem
  4. Xylem transports inorganic nutrients while phloem transports organic materials, this observation was proved wrong by the analysis of xylem exudate
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