Water transport pathways in plant roots

Steps:

• Recall apoplast pathway moves water through cell walls and intercellular spaces, bypassing cytoplasm.
• Recall symplast pathway moves water through cytoplasm connected by plasmodesmata.
• Note Casparian strip in endodermis, impregnated with lignin and suberin, blocks apoplast flow.
• Match choices: A describes apoplast via intercellular spaces near Casparian strip barrier.

Why A is correct:

• Apoplast pathway uses intercellular spaces for water movement, and Casparian strip (with lignin) regulates it by forcing selective entry.

Why the others are wrong:

• B: Plasmodesmata connect symplast, not apoplast; lignin is irrelevant here.
• C: Symplast uses plasmodesmata, but lignin does not define this cytoplasmic route.
• D: Intercellular spaces are for apoplast, not symplast; suberin blocks, doesn't facilitate symplast.

Final answer: A