Question

_____________ are elongated or tube-like dead cells with hard, thick and lignified walls.

• A. Tracheids
• B. Sieve elements
• C. Phloem parenchyma
• D. All the above

Answer 1

The correct option is A Tracheids

Xylem tracheids:

• They are elongated or tube-like dead cells with hard, thick and lignified walls.
• Their ends are tapering, blunt or chisel-like. These cells are devoid of protoplast.
• They have large lumen without any content.
• Their function is conduction of water and providing mechanical support to the plant.