A medium of transportation of materials in plants is the

The cell sap is the aqueous solution found within plant cells, particularly in the vacuole, and it serves as the medium in which dissolved substances (mineral salts, sugars, amino acids, and other metabolites) are transported within and between plant cells. The question specifically asks about the medium of transportation, meaning the liquid substance that carries materials, rather than the structural tissues or channels through which transport occurs.

Xylem and phloem are vascular tissues (the channels or pathways) through which materials are transported, not the medium itself. The xylem conducts water and dissolved minerals upward, while the phloem translocates organic solutes such as sucrose. Cytoplasm is the general cellular matrix that fills the cell, but it is not the term used to describe the transport medium in the context of whole-plant material movement.

When a question distinguishes between the transport medium and the transport tissue, remember: the medium is the solution (cell sap), while the tissues are the conduits (xylem and phloem).