On a commercial scale, enhancing the level of _______ (hormone) can help to speed up fruit ripening.  •    What measure do fruit producers take to slow down fruit ripening that is caused by natural ethylene? •    What is a ‘triple response’. Which plant hormone initiates a triple response?  •    A change in the ratio of ethylene to auxin controls abscission. In the autumn, the amount of __________ decreases, rendering the cells of the abscission layer more sensitive to __________.

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