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Question

“Triple response”, a key reaction of ethylene, is characterized by:

A Plumule hook opening, positive gravitropism and internodal elongation.

B Excessive cytokinesis, negative phototropism and parthenocarpy.

C Inhibition of stem elongation, promotion of lateral swelling of stems, and reduced sensitivity of stems to gravitropic stimulation.

D Fruit ripening, plumule hook opening and negative phototropism.

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