A region of separation that forms near the base of the leaf's petiole when the leaf is shed is the:

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The abscission zone is the region of separation where the leaf petiole detaches from the stem or branch of a plant. This process typically occurs during fall, when leaves change color and drop off the plant. The abscission zone is marked by the presence of specialized cells that weaken and break down the tissue connecting the leaf to the plant.

A Region of Separation That Forms near the Base of the Leaf's