Which hormone exhibits the triple response?

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(A) The triple response is a classic physiological effect observed in etiolated pea seedlings treated with ethylene. It consists of three distinct com

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Ethylene

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(A) The triple response is a classic physiological effect observed in etiolated pea seedlings treated with ethylene. It consists of three distinct components: $1.$ Inhibition of stem elongation,$2.$ Promotion of lateral expansion (swelling) of the stem,and $3.$ Horizontal growth (loss of normal geotropic orientation).

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