Which tissue is primarily responsible for transporting water within a plant?

Which tissue is primarily responsible for transporting water within a plant?

• A. Leaves
• B. Phloem
• C. Roots
• D. Xylem

Answer: (D)

The main idea here is identifying the tissue specialized for moving water through the plant. Xylem is built for this job: it’s a network of hollow, dead cells (vessel elements and tracheids) that form continuous tubes from the roots up into the stems and leaves. Water and dissolved minerals travel upward through these tubes driven by the transpiration pull in the leaves, working through cohesion among water molecules and adhesion to the tube walls. This makes xylem the primary conduit for water transport. Leaves are the sites where water is lost and where photosynthesis occurs, but they’re not the main transport channels for moving water through the plant. Roots absorb water from the soil and initiate its entry into the plant, but the actual long-distance transport system is xylem. Phloem transports sugars and other organic nutrients, often in multiple directions, rather than being the primary water-conducting tissue.

The main idea here is identifying the tissue specialized for moving water through the plant. Xylem is built for this job: it’s a network of hollow, dead cells (vessel elements and tracheids) that form continuous tubes from the roots up into the stems and leaves. Water and dissolved minerals travel upward through these tubes driven by the transpiration pull in the leaves, working through cohesion among water molecules and adhesion to the tube walls. This makes xylem the primary conduit for water transport.

Leaves are the sites where water is lost and where photosynthesis occurs, but they’re not the main transport channels for moving water through the plant. Roots absorb water from the soil and initiate its entry into the plant, but the actual long-distance transport system is xylem. Phloem transports sugars and other organic nutrients, often in multiple directions, rather than being the primary water-conducting tissue.