Food conduction in gymnosphere, food conduction in angiosperm -
In gymnosperms and pteridophytes, sieve tubes are absent and sieve cells are arranged irregularly. So conduction of food takes place in zig-zag manner.
In angiosperm, food conduction is erect and efficient. Food conduction is bidirectional in sieve tube, sieve tube is an example of living syncyte
Tracheids are chief water conducting elements of xylem in gymnosperms. They are devoid of protoplasm and hence dead. The wall constituting the tracheids is hard, thick and lignified. These are elongated cells with tapering ends.