Which of the following is a plant hormone?

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(A) Dormin, also known as Abscisic Acid $(ABA)$, is a well-known plant growth inhibitor and hormone.Formalin is a $40\%$ solution of formaldehyde, whi

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Dormin

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(A) Dormin, also known as Abscisic Acid $(ABA)$, is a well-known plant growth inhibitor and hormone.Formalin is a $40\%$ solution of formaldehyde, which is used as a disinfectant or preservative, not a hormone.Acetylene is a hydrocarbon gas $(C_2H_2)$ often used in welding; while it can induce ripening, it is not a naturally occurring plant hormone like $ABA$ or Ethylene.Therefore, only Dormin is a plant hormone.

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