Question

The main vein of the leaf is called--------
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Answer 1

Answer:

A leaf is often organized with one main vein running down the middle of the blade. This vein is called the midrib. All of the veins, the petiole, and the midrib help position the blade so that it is facing the light source.

Answer 2

pholem and xylem isn't it I guess they are complex merismetic tissue.