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