Xylem Vessel Adaptations for Efficient Water Transport

Steps:

• Identify key features of xylem vessels: dead, hollow cells with lignified walls for unidirectional water flow via transpiration pull.
• Evaluate options for structural adaptations that minimize resistance and maximize water adhesion.
• Eliminate inaccuracies about living cell features or incorrect associations.
• Confirm the option aligning with hydrophilic properties for capillary action.

Why C is correct:

• Cellulose in walls is hydrophilic, forming hydrogen bonds with water to enable adhesion and capillary rise, per principles of cohesion-tension theory.

Why the others are wrong:

• A: Xylem vessels are dead cells lacking cytoplasm and organelles entirely.
• B: End walls are perforated or absent, but this forms continuous tubes; resistance reduction is due to width and smoothness, not just end walls.
• D: Xylem vessels lack plasmodesmata and companion cells, which are phloem features for active transport.

Final answer: C