Which of the following is incorrect statement?
- 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
- Small amount of P and S is also carried as inorganic compounds in xylem exudate
- There is exchange of material between xylem and phloem
- Xylem transports inorganic nutrients while phloem transports organic materials, this observation was proved wrong by the analysis of xylem exudate