Which of the following delays senescence

Options :
  1. cytokinin
  2. gibberellin
  3. indole acetic acid
  4. ABA
Answer and Explanation :-

Answer: Option 1

Explanation:

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For like a shaft, clear and cold, the thought pierced him that in the end the Shadow was only a small and passing thing: there was light and high beauty for ever beyond its reach.
-J.R.R. Tolkien The Return of the King