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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