Q. I. Long cyclindrical tube like structure made up of many cells called vessel members, lignified cell wall and large central cavity II. Devoid of protoplasm Above characters belong to which of the following plant elements?
A) Tracheids
B) Xylem vessel
C) Companion cell
D) Sieve tube
Explanation
Xylem vessels are the tube-like structure. The walls of the xylem vessels are lignified. They lack the protoplasm. They are thick and variously-annular, spiral, reticulate, scalariform and pitted. The pitted condition is more common
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.