AP BIOLOGY

Detailed explanation-1: -It contains a prominent midrib at the center of the leaf blade which is the main vein. From this midrib arise branches called veins.

Detailed explanation-2: -In this study, we defined “lateral veins” as secondary veins that originated from the midvein and ran toward the leaf margin. For leaves that had more than one primary vein, only the midveins were measured.

Detailed explanation-3: -mid·rib ˈmid-ˌrib. : the central vein or ridge of a leaf or a leaflike part.

Detailed explanation-4: -Veins in a branching pattern are called netted veins. A cross section of a leaf blade reveals a layer of cuticle covering a layer of epidermal cells. Beneath the upper epidermis are a layer of standing cells called the palisade mesophyll and a layer of loosely packed cells called the spongy mesophyll.