Tracheids differ from other tracheary elements in: Having Casparian strips, Being imperforate, Lacking nucleus, Being lignified

Tracheids and vessels are two types of tracheary elements of xylem tissue. The main function of tracheary elements is the ascent of sap. Tracheids have imperforated cells, thus keeping the sap longer in them, while vessels are highly perforated. Vessels have various types of perforations. As there is no perforation in tracheids, the cells are less sufficient for transportation while vessels are more sufficient in carrying the sap. So, the correct answer is 'Being imperforate'.