Which of the following plant hormones stimulates development of an abscission zone in the leaf petiole?

Question

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Ethylene is the plant hormone that stimulates the development of an abscission zone in the leaf petiole. The abscission zone is a region of cell separation that allows the leaf to detach from the plant when it is ready to fall off. Ethylene also plays a role in the ripening of fruit and is produced in response to stress, such as drought or damage.

Which of the Following Plant Hormones Stimulates Development of an Abscission