The chief water conducting elements of xylem in gymnosperms are

1. vessels

2. fibres

3. transfusion tissue

4. tracheids

Vessels are found in : -

(1) All angiosperms and some gymnosperm

(2) Most of the angiosperm and few gymnosperms

(3) All angiosperms, all gymnosperms and some pteridophyta

(4) All pteridophyta