Question

Which among the following is NOT a characteristic of xylem trachieds?

• A. They are long cylindrical tube-like cells
• B. These are dead without protoplasm
• C. The inner layers of the cell walls have thickenings which vary in form
• D. They are water transporting elements

Answer 1

Answer:

A. They are long cylindrical tube-like cells

• The tracheid is the basic cell in the xylem, that is, all plants have tracheids, but not the more highly evolved vessel elements.

• Tracheids are generally spindle shaped, very elongate, and have tapered ends.

• Tracheids have a dual function of support and water conduction, whereas vessel elements, except perhaps for some primitive types, function in conduction only.