The chemical that is primarily responsible for the shedding of a leaf from a plant is

Options :
  1. Ethylene
  2. Indole-3 acetic acid
  3. Abscisic acid
  4. Auxins
Answer and Explanation :-

Answer: Option 1

Explanation:

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This autumn-why am I growing old?bird disappearing among clouds.
-Matsuo Basho