AP BIOLOGY

Detailed explanation-1: -The central, thick, linear vein that runs along the length of a leaf is called midrib.

Detailed explanation-2: -The vascular tissue of the leaf are called veins. They are thin lines present on the leaf blade or lamina. Midrib is the thickest vein present on the central part of the leaf.

Detailed explanation-3: -The vein xylem transports water from the petiole throughout the lamina mesophyll, and the phloem transports sugars out of the leaf to the rest of the plant.

Detailed explanation-4: -Different Parts of the leaf: The distinct middle line in leaf is called the midrib. The other lines in the leaf are called the veins. The veins together form a design called the leaf venation.