Accurate depiction of apoplast and symplast pathways in plant transport

Steps:

• Define apoplast pathway: water flows through cell walls and intercellular spaces without crossing membranes.
• Define symplast pathway: water moves cell-to-cell via cytoplasm and plasmodesmata connections.
• Identify key diagram features: apoplast shows extracellular route; symplast shows intracellular links.
• Compare sketches to definitions, selecting the one matching both pathways precisely.

Why D is correct:

• It illustrates apoplast as continuous cell wall path and symplast as cytoplasmic bridges via plasmodesmata, aligning with standard plant physiology definitions.

Why the others are wrong:

• A: Reverses pathways by showing symplast through walls.
• B: Omits plasmodesmata in symplast depiction.
• C: Depicts both pathways as membrane-crossing, ignoring apoplast's extracellular nature.

Final answer: D