Which of the following does not refer to plant structure?

Translocation is a process that refers to the movement of nutrients and water within a plant, rather than a specific part or structure of the plant itself. The other options—node, internode, and root—are all specific physical parts of a plant.

A node is the part of a plant stem where leaves are attached, while an internode is the segment of the stem between two nodes. The root is the underground part of a plant that anchors it and absorbs water and nutrients from the soil. Thus, translocation stands out as it describes a function rather than a structural component of a plant.