Xylem Vessel Features in Plant Transport

Steps:

• Xylem vessels are dead, hollow cells specialized for water conduction with supportive structures.
• Lignified walls (1) provide mechanical strength and prevent collapse under tension.
• Pits (4) in walls allow lateral water flow between adjacent vessels.
• Absence of cytoplasm (2), mitochondria (3), plasmodesmata (5), and sieve plates (6) confirms vessels are non-living without metabolic activity or phloem traits.

Why B is correct:

• Plant anatomy defines xylem vessels as having lignified walls for support and pits for efficient water percolation, excluding living cell features.

Why the others are wrong:

• A includes cytoplasm and plasmodesmata, absent in dead xylem vessels.
• C lists cytoplasm, mitochondria, and sieve plates, which belong to living phloem cells.
• D features mitochondria, plasmodesmata, and sieve plates, not present in non-living xylem.

Final answer: B