Tracheids differ from the tracheary elements in:
1. Having casparian strips
2. Being imperforate
3. Lacking nucleus
4. Being lignified
Gymnosperms are also called softwood spermatophytes because they lack:
1. Cambium
2. Phloem fibres
3. Thick-walled tracheids
4. Xylem fibres
The chief water conducting elements of xylem in gymnosperms are:
1. vessels
2. fibres
3. transfusion tissue
4. tracheids