Question

Tracheids differ from other tracheary elements in

• A. Being lignified
• B. Lacking nucleus
• C. Being imperforate
• D. Having Casparian strips

Answer 1

Answer:

C. Being imperforate

• Tracheids are elongated, dead cells with hard lignified walls, wide lumens and narrow walls with spiral, annular, reticulate, scalariform and pitted thickening but without perforated end walls of septa.

• That is, they have intact end walls unlike vessels.

• Vessels are long cylindrical tube like structures made of many cells, called vessel members, each with lignified walls and a large central cavity.

• Vessel members are interconnected through perforation in their common walls.