Question

what plant hormone does ripe fruit give off?
○ adrenaline.
○ ethylene.
○ retinol.
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Explanation:

Adrenaline is a hormone in animals (not plants). Retinol is a form of vitamin A (not a plant hormone for ripening). Ethylene is a plant hormone that ripened fruits emit to trigger further ripening.

Answer:

B. Ethylene.