Given the following descriptions, identify the feature(s) that correctly describe(s)  tracheids and vessel elements.
X. Both are non-living
Y. Perforation plates are present in vessel elements but absent in tracheids
Z. Both are highly efficient in water conduction

• A. Only X is true
• B. Both X and Y are true
• C. Only Z is true
• D. All X, Y, and Z are true

Answer: (B)