Leaf may be defined as the organ of the vascular plant and acts as the principal lateral appendage of the stem parts. Leaf acts as the kitchen house of the cell.
The veins of the leaf helps in the transportation of the materials to and away from the leaf. The veins also support the lamina and radiates from the petiole. The leaf veins are made of the special cells known as the vascular bundle and leaf venation determines the different kind of leaves.
In the question, the figure is not provided but based on the previous knowledge the structure and function of a vein in the plant cell can be explained.
A plant vein is a vascular structure present in the leaves which transports the water and nutrients to the leaves and sugar from the leaves to the different parts of the plant.
Since the vein is a vascular structure therefore it is made up of the xylem which transports the water and the phloem which transports the food material to the leaves and sugar from the leaves to the plant.
