Movement of substances in xylem is unidirection while in phloem it is bidirectional. Explain

Movement of substances in xylem is unidirection while in phloem it is bidirectional. Explain
Movement of substances in xylem is unidirection while in phloem it is bidirectional. Explain
Movement of substances in xylem is unidirection while in phloem it is bidirectional. Explain
Movement of substances in xylem is unidirection while in phloem it is bidirectional. Explain

Explain