What is the function of the Casparian strip in the root?
A) It protects the surface of the root but allows water to be absorbed.
B) It allows for horizontal transport of water and nutrients.
C) It is the portion of the root that contains numerous root hairs.
D) It is an internal water-proofed layer that prevents water and minerals from moving through intercellular spaces on their way to the vascular tissue.
E) It seals the surface of roots that have been damaged.
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