Concept:Xylem transports water and mineral salts upward, while phloem transports manufactured food downward.
Explanation:In vascular plants, the xylem carries water and dissolved mineral salts from the roots up to the stem, leaves, and other parts of the plant.
This upward movement is represented by the arrow labelled
I.
The phloem carries soluble organic food substances, such as sucrose, produced during photosynthesis from the leaves to the rest of the plant.
This downward movement is represented by the arrow labelled
III.
Therefore, the transport materials in the xylem and phloem are shown by the arrows labelled
I and
III respectively.
Answer:D.
I and
III respectively.
