Q. I. Elongated or tube like cell with thick and lignified walls and tapering ends II. These are dead and without the protoplasm III. The inner layers of cell walls have thickening which vary in form The above mentioned characters belong to which of the following plant structure?

A) Tracheids
B) Xylem parenchyma
C) Companion cells
D) Sieve tube element
Explanation

Tracheids are elongated or tube like cells with thick and lignified walls and tapering ends. These are dead and are without protoplasm. The inner layers of the cell walls have thickenings which vary in form. In flowering plants, tracheids and vessels are the main water transporting elements

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.